Support get optimizer and lr_schedulers from deepspeed config

[npuichigo]

Description & Motivation

Currently it's not supported. However in huggingface/accelerate, users can specify DummyOptimizer and DummyScheduler to indicate they want them to be replaced by those from deepspeed config.

Pitch

Lightning should have some way to let people use optimizers from deepspeed config, like OneBitAdam or something else that cannot be manually instantiated.

pytorch-lightning/src/lightning/fabric/strategies/deepspeed.py

Line 330 in 90d04b5

self._deepspeed_engine, optimizer = self._initialize_engine(module, optimizers[0])

Alternatives

No response

Additional context

No response

cc @Borda