Migrating from Flask to FastAPI

[kaditya97]

Migrating from Flask to FastAPI to achieve performance, for more have a look at the discussion here

Steps for the migration

• [x] #6417
• [x] Change all schematics models to pydantic model
• [x] #6418
• [ ] #6398
• [x] #6292
• [x] #6420
• [x] Update all queries to use the async approach
• [x] Remove all dependencies with flask
• [ ] Update all functions to be compatible with FastAPI setup
• [ ] Update docs to reflect changes for FastAPI
• [ ] Update Test cases for FastAPI setup
• [x] #6413 cc @dakotabenjamin @eternaltyro
• [ ] #6438

For changes have a look at this branch

[ramyaragupathy]

@kaditya97 @prabinoid - it will be really useful to split and track them into smaller tasks as your make progress on it

cc @manjitapandey