Add ASGI BASED Middleware

[bensarifathi]

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🚀 Feature Request am trying to use this library https://github.com/melvinkcx/fastapi-events which use an ASGI middleware and when i tryed to add this middleware to my app i got the following error: AttributeError: 'EventHandlerASGIMiddleware' object has no attribute '__qualname__'

Middleware call signature: async def __call__(self, scope: Scope, receive: Receive, send: Send) -> None: