[Python-Dev] Adding c-api async protocol support

[Arc Riley]

A type slot for tp_as_async has already been added (which is good!) but we
do not currently seem to have protocol functions for awaitable types.

I would expect to find an Awaitable Protocol listed under Abstract Objects
Layer, with functions like PyAwait_Check, PyAwaitIter_Check, and
PyAwaitIter_Next, etc.

Specifically its currently difficult to test whether an object is awaitable
or an awaitable iterable, or use said objects from the c-api without
relying on method testing/calling mechanisms.
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