Add auth mechanism to Fast API to use Gitea Oauth tokens

[RevantCI]

Add auth mechanism to Fast API to use Gitea Oauth tokens

[Joel-Joseph-George]

Since we need to move the fastapi app to the staging , we need a authentication to protect our api.
The plan is to use Gitea generated access_token to validate the FastAPI apis.

• Generate token in UI
• Pass the token in headers of all the api calls send to the Fastapi
• Once the token gets into the api, validate it with a function
• Create a validate token function which uses /users from gitea-api
• Validate token function will validate the token passed as the header with respect to the output from gitea and returns the status
• API will show the output based on the validate token function. if the user is valid then the api will be