Enhance typing for cloud_api decorators

[ludeeus]

The current hints for the decorators, while valid, do not offer much insight.

(function) def async_remote_token(...) -> Awaitable[ClientResponse]

With this change, that becomes:

(function) def async_remote_token(
    Cloud[_ClientT@async_remote_token],
    aes_key: bytes,
    aes_iv: bytes
) -> Coroutine[Any, Any, ClientResponse]

This change also allows passing kwargs to decorated functions that did not work previously.