[Feature request] Support WebSocket connections.

[epelaez1]

Hello!
First of all thank you for this repo! It has saved me a lot of time.

I have tried to use SingleTenantAzureAuthorizationCodeBearer with a web socket connection and FastAPI throws this error:

TypeError: AzureAuthorizationCodeBearerBase.__call__() missing 1 required positional argument: 'request'

I think it would be very easy to add support to WebSockets, just replacing the dependency type from starlette.requests.Request to starlette.requests.HTTPConnection.

As described in documentation:

When you want to define dependencies that should be compatible with both HTTP and WebSockets, you can define a parameter that takes an HTTPConnection instead of a Request or a WebSocket.

I tried a quick patch replacing it in AzureAuthorizationCodeBearerBase.__call__ and in OAuth2AuthorizationCodeBearer.__call__, and it worked perfectly.

HTTPConnection is the base class for both WebSocket and Request, and it has the headers and state properties, so it would probably be backwards compatible.

Let me know if you think it is feasible! If you need hands on, I can try to do a PR.

[JonasKs]

Hi!
I'd love to get a PR for this. Let me know if I can help.