Move all API endpoints to address FastAPI async query

[ramyaragupathy]

Creating smaller tasks to track progress. @kaditya97 @prabinoid please add details

cc @manjitapandey

[kaditya97]

• Create new API endpoints using Fastapi APIRouter
• Change authentication system using starlette.authentication
• Change all functions to async async def ....
• Make changes to functions data to address async
• Add await to db queries