[issue40816] Add missed AsyncContextDecorator to contextlib

[Андрей Казанцев]

New submission from Андрей Казанцев <heckad at yandex.ru>:

I can use context manager as decorator but can't use async context manager. Seems it because didn't implemented AsyncContextDecorator class

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components: Library (Lib)
messages: 370317
nosy: heckad
priority: normal
severity: normal
status: open
title: Add missed AsyncContextDecorator to contextlib
versions: Python 3.9

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue40816>
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