UI Improvements as written in Amogh's doc

[iskakaushik]

• Mirror Templates/Drafts: I want to be able to define create mirror templates which I can load and edit instead of typing in the fields again
• Export Create Mirror to SQL: I want to be able to obtain the corresponding CREATE MIRROR command for this create mirror page
• Dark Mode: I want to have a dark colour scheme for the web app
• TablePicker: Upload CSV/Excel: I want to be able to upload a file I have which specifies the tables I want to sync
• TablePicker: Override Schema name: I want to set a different schema name in schema.table for the target tables in CDC
• Rename mirrorless peers: I want to be able to rename peers which are not part of any mirrors
• Confirm Page for Create Mirror: I want to be able to check and confirm my settings for the mirror before creating it
• Schema Changes Log: I want to be able to see a history of schema changes in mirrors
• Detailed peer pages for target peers: I wish to see some information about my target peers when I click on them