StreamChatAsync does not clean up resources according to httpaio

[DenisSazhaevBench]

Summary:
httpaio generates error messages due to an unclosed connection.
Having taken a quick look at stream_chat/async_chat/client.py, calling session.close() on aexit does not satisfy httpaio in my scenario.

Environment:
AWS Lambda
AWS Powertools v2.34.2 via AsyncBatchProcessor
stream-chat v4.12.1
Python v3.11

Relevant error messages:

"2024-03-25T22:26:43.353Z","[ERROR]	2024-03-25T22:26:43.353Z	2f7ab88d-c683-46f7-b6dc-616ab9f3241f	Unclosed client session"
"2024-03-25T22:26:43.353Z","connector: <aiohttp.connector.TCPConnector object at 0x7fdf32456f50>"
"2024-03-25T22:26:43.353Z","connections: ['[(<aiohttp.client_proto.ResponseHandler object at 0x7fdf1a99a970>, 331.795931377)]']"
"2024-03-25T22:26:43.353Z","[ERROR]	2024-03-25T22:26:43.353Z	2f7ab88c-b683-46f7-b6dc-616ab9f3241f	Unclosed connector"

Verbose log:

Date,Message
"2024-03-25T22:26:43.407Z","REPORT RequestId: 2f7ab88c-b683-46f7-b6dc-616ab9f3241f	Duration: 499.26 ms	Billed Duration: 500 ms	Memory Size: 1024 MB	Max Memory Used: 395 MB"
"2024-03-25T22:26:43.407Z","END RequestId: 2f7ab88c-b683-46f7-b6dc-616ab9f3241f"
"2024-03-25T22:26:43.404Z","[WARNING]	2024-03-25T22:26:43.404Z	2f7ab88c-b683-46f7-b6dc-616ab9f3241f	Executing <Task finished name='Task-6' coro=<AsyncBatchProcessor._async_process_record() done, defined at /var/task/aws_lambda_powertools/utilities/batch/base.py:634> result=('success', ...) created at /var/lang/lib/python3.11/asyncio/tasks.py:680> took 0.475 seconds"
"2024-03-25T22:26:43.353Z","super().__init__("
"2024-03-25T22:26:43.353Z","File ""/var/task/aiohttp/connector.py"", line 776, in __init__"
"2024-03-25T22:26:43.353Z","connector=aiohttp.TCPConnector(keepalive_timeout=59.0),"
"2024-03-25T22:26:43.353Z","File ""/var/task/stream_chat/async_chat/client.py"", line 68, in __init__"
"2024-03-25T22:26:43.353Z","client = StreamChatAsync("
"2024-03-25T22:26:43.353Z","File ""/var/task/helpers/streamchat_client.py"", line 18, in __init__"
"2024-03-25T22:26:43.353Z","stream_client = StreamChatClient(completionRequested.conversation.channelId)"
"2024-03-25T22:26:43.353Z","File ""/var/task/categorizer.py"", line 56, in async_record_handler"
"2024-03-25T22:26:43.353Z","result = await self.handler(record=data)"
"2024-03-25T22:26:43.353Z","File ""/var/task/aws_lambda_powertools/utilities/batch/base.py"", line 649, in _async_process_record"
"2024-03-25T22:26:43.353Z","self._context.run(self._callback, *self._args)"
"2024-03-25T22:26:43.353Z","File ""/var/lang/lib/python3.11/asyncio/events.py"", line 84, in _run"
"2024-03-25T22:26:43.353Z","handle._run()"
"2024-03-25T22:26:43.353Z","File ""/var/lang/lib/python3.11/asyncio/base_events.py"", line 1928, in _run_once"
"2024-03-25T22:26:43.353Z","self._run_once()"
"2024-03-25T22:26:43.353Z","File ""/var/lang/lib/python3.11/asyncio/base_events.py"", line 608, in run_forever"
"2024-03-25T22:26:43.353Z","self.run_forever()"
"2024-03-25T22:26:43.353Z","File ""/var/lang/lib/python3.11/asyncio/base_events.py"", line 641, in run_until_complete"
"2024-03-25T22:26:43.353Z","return loop.run_until_complete(task_instance)"
"2024-03-25T22:26:43.353Z","File ""/var/task/aws_lambda_powertools/utilities/batch/base.py"", line 126, in async_process"
"2024-03-25T22:26:43.353Z","processor.async_process()"
"2024-03-25T22:26:43.353Z","File ""/var/task/aws_lambda_powertools/utilities/batch/decorators.py"", line 251, in async_process_partial_response"
"2024-03-25T22:26:43.353Z","return async_process_partial_response("
"2024-03-25T22:26:43.353Z","File ""/var/task/categorizer.py"", line 103, in handler"
"2024-03-25T22:26:43.353Z","response = request_handler(event, lambda_context)"
"2024-03-25T22:26:43.353Z","File ""/var/lang/lib/python3.11/site-packages/awslambdaric/bootstrap.py"", line 188, in handle_event_request"
"2024-03-25T22:26:43.353Z","handle_event_request("
"2024-03-25T22:26:43.353Z","File ""/var/lang/lib/python3.11/site-packages/awslambdaric/bootstrap.py"", line 499, in run"
"2024-03-25T22:26:43.353Z","bootstrap.run(app_root, handler, lambda_runtime_api_addr)"
"2024-03-25T22:26:43.353Z","File ""/var/lang/lib/python3.11/site-packages/awslambdaric/__main__.py"", line 21, in main"
"2024-03-25T22:26:43.353Z","awslambdaricmain.main([os.environ[""LAMBDA_TASK_ROOT""], os.environ[""_HANDLER""]])"
"2024-03-25T22:26:43.353Z","File ""/var/runtime/bootstrap.py"", line 60, in main"
"2024-03-25T22:26:43.353Z","main()"
"2024-03-25T22:26:43.353Z","File ""/var/runtime/bootstrap.py"", line 63, in <module>"
"2024-03-25T22:26:43.353Z","source_traceback: Object created at (most recent call last):"
"2024-03-25T22:26:43.353Z","connector: <aiohttp.connector.TCPConnector object at 0x7fdf32456f50>"
"2024-03-25T22:26:43.353Z","connections: ['[(<aiohttp.client_proto.ResponseHandler object at 0x7fdf1a99a970>, 331.795931377)]']"
"2024-03-25T22:26:43.353Z","[ERROR]	2024-03-25T22:26:43.353Z	2f7ab88c-b683-46f7-b6dc-616ab9f3241f	Unclosed connector"
"2024-03-25T22:26:43.353Z","self.session = aiohttp.ClientSession("
"2024-03-25T22:26:43.353Z","File ""/var/task/stream_chat/async_chat/client.py"", line 66, in __init__"
"2024-03-25T22:26:43.353Z","client = StreamChatAsync("
"2024-03-25T22:26:43.353Z","File ""/var/task/helpers/streamchat_client.py"", line 18, in __init__"
"2024-03-25T22:26:43.353Z","stream_client = StreamChatClient(completionRequested.conversation.channelId)"
"2024-03-25T22:26:43.353Z","File ""/var/task/categorizer.py"", line 56, in async_record_handler"
"2024-03-25T22:26:43.353Z","result = await self.handler(record=data)"
"2024-03-25T22:26:43.353Z","File ""/var/task/aws_lambda_powertools/utilities/batch/base.py"", line 649, in _async_process_record"
"2024-03-25T22:26:43.353Z","self._context.run(self._callback, *self._args)"
"2024-03-25T22:26:43.353Z","File ""/var/lang/lib/python3.11/asyncio/events.py"", line 84, in _run"
"2024-03-25T22:26:43.353Z","handle._run()"
"2024-03-25T22:26:43.353Z","File ""/var/lang/lib/python3.11/asyncio/base_events.py"", line 1928, in _run_once"
"2024-03-25T22:26:43.353Z","self._run_once()"
"2024-03-25T22:26:43.353Z","File ""/var/lang/lib/python3.11/asyncio/base_events.py"", line 608, in run_forever"
"2024-03-25T22:26:43.353Z","self.run_forever()"
"2024-03-25T22:26:43.353Z","File ""/var/lang/lib/python3.11/asyncio/base_events.py"", line 641, in run_until_complete"
"2024-03-25T22:26:43.353Z","return loop.run_until_complete(task_instance)"
"2024-03-25T22:26:43.353Z","File ""/var/task/aws_lambda_powertools/utilities/batch/base.py"", line 126, in async_process"
"2024-03-25T22:26:43.353Z","processor.async_process()"
"2024-03-25T22:26:43.353Z","File ""/var/task/aws_lambda_powertools/utilities/batch/decorators.py"", line 251, in async_process_partial_response"
"2024-03-25T22:26:43.353Z","return async_process_partial_response("
"2024-03-25T22:26:43.353Z","File ""/var/task/categorizer.py"", line 103, in handler"
"2024-03-25T22:26:43.353Z","response = request_handler(event, lambda_context)"
"2024-03-25T22:26:43.353Z","File ""/var/lang/lib/python3.11/site-packages/awslambdaric/bootstrap.py"", line 188, in handle_event_request"
"2024-03-25T22:26:43.353Z","handle_event_request("
"2024-03-25T22:26:43.353Z","File ""/var/lang/lib/python3.11/site-packages/awslambdaric/bootstrap.py"", line 499, in run"
"2024-03-25T22:26:43.353Z","bootstrap.run(app_root, handler, lambda_runtime_api_addr)"
"2024-03-25T22:26:43.353Z","File ""/var/lang/lib/python3.11/site-packages/awslambdaric/__main__.py"", line 21, in main"
"2024-03-25T22:26:43.353Z","awslambdaricmain.main([os.environ[""LAMBDA_TASK_ROOT""], os.environ[""_HANDLER""]])"
"2024-03-25T22:26:43.353Z","File ""/var/runtime/bootstrap.py"", line 60, in main"
"2024-03-25T22:26:43.353Z","main()"
"2024-03-25T22:26:43.353Z","File ""/var/runtime/bootstrap.py"", line 63, in <module>"
"2024-03-25T22:26:43.353Z","source_traceback: Object created at (most recent call last):"
"2024-03-25T22:26:43.353Z","client_session: <aiohttp.client.ClientSession object at 0x7fdf1c022190>"
"2024-03-25T22:26:43.353Z","[ERROR]	2024-03-25T22:26:43.353Z	2f7ab88d-c683-46f7-b6dc-616ab9f3241f	Unclosed client session"
"2024-03-25T22:26:42.930Z","[WARNING]	2024-03-25T22:26:42.930Z	2f7ab88c-b683-46f7-b6dc-616ab9f3241f	Could not send typing start event to stream chat - StreamChat error code 16: SendEvent failed with error: ""Can't find channel with id"""""
"2024-03-25T22:26:42.911Z","[INFO]	2024-03-25T22:26:42.911Z	2f7ab88c-b683-46f7-b6dc-616ab9f3241f	Sending typing start event to stream chat channel"
"2024-03-25T22:26:42.908Z","[INFO]	2024-03-25T22:26:42.908Z	2f7ab88c-b683-46f7-b6dc-616ab9f3241f	Received 1 records."
"2024-03-25T22:26:42.908Z","[INFO]	2024-03-25T22:26:42.908Z	2f7ab88c-b683-46f7-b6dc-616ab9f3241f	Starting handler..."
"2024-03-25T22:26:42.907Z","START RequestId: 2f7ab88c-b683-46f7-b6dc-616ab9f3241f Version: 75"