Fastapi-websocket-rpc

Improved logging support.
Provide a simple interface to switch between loguru, simple logs, no logs, and logging alongside uvicorn.

Graceful shutdowns and error messages

- Added channel readiness check (via RPC pinging) prior to
- Allow multiple callbacks for on_connect and on_disconnect
- bug fixes

- Keep alive support
- Core events handling in RPC channel (connect, disconnect, and error handlers)