[issue46622] Support decorating a coroutine with functools.cached_property

[Tzu-ping Chung]

Tzu-ping Chung <uranusjr at gmail.com> added the comment:

> should not use asyncio directly but 'async def', 'await', and `inspect.iscoroutine()` / `inspect.iscoroutinefunction()` instead.

Hmm, this introduces some difficulties. Since a coroutine can only be awaited once, a new coroutine needs to be returned (that simply return the result when awaited) each time __get__ is called. But this means we need a way to somehow get the result in __get__. If there’s a separate `cached_property_async` it’s possible to make __get__ a coroutine function, but personally I’d prefer the interface to match the PyPI cached_property.

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<https://bugs.python.org/issue46622>
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