Coroutine as websocket callback function

[OmniReality]

There is no way in the web socket when you initialize it to send a coroutine instead of a regular function as the on_message callback. any async is unable to run as part of that or required some workaround.

the change should take place here in my opinion:
https://github.com/coinbase/coinbase-advanced-py/blob/master/coinbase/websocket/websocket_base.py#L508

[github-actions]

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