Add missed AsyncContextDecorator to contextlib

[heckad]

BPO	40816
Nosy	@jab, @asvetlov, @1st1, @heckad, @belm0, @Fidget-Spinner
PRs	bpo-40816 Add AsyncContextDecorator class #20516 bpo-40816: [docs] Fix wrongly named AsyncContextManager #23164

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2020-11-05.08:53:43.151>
created_at = <Date 2020-05-29.14:53:13.152>
labels = ['library', '3.10']
title = 'Add missed AsyncContextDecorator to contextlib'
updated_at = <Date 2020-11-05.15:12:45.320>
user = 'https://github.com/heckad'

bugs.python.org fields:

activity = <Date 2020-11-05.15:12:45.320>
actor = 'kj'
assignee = 'none'
closed = True
closed_date = <Date 2020-11-05.08:53:43.151>
closer = 'asvetlov'
components = ['Library (Lib)']
creation = <Date 2020-05-29.14:53:13.152>
creator = 'heckad'
dependencies = []
files = []
hgrepos = []
issue_num = 40816
keywords = ['patch']
message_count = 6.0
messages = ['370317', '370630', '370817', '371834', '373802', '380398']
nosy_count = 6.0
nosy_names = ['jab', 'asvetlov', 'yselivanov', 'heckad', 'John Belmonte', 'kj']
pr_nums = ['20516', '23164']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue40816'
versions = ['Python 3.10']

[heckad]

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

[1st1]

This has long been implemented: https://docs.python.org/3/library/contextlib.html#contextlib.asynccontextmanager

[heckad]

No, please look at the pull request.

[heckad]

Yury Selivanov, did you see the pull request?

[belm0]

Thank you heckad!

I'm in need of a decorating asynccontextmanager, and glad that an implementation is in the works that I can copy from in the meantime.

I hope Yuri reviews the PR before long.

[asvetlov]

New changeset 178695b by Kazantcev Andrey in branch 'master':
bpo-40816 Add AsyncContextDecorator class (GH-20516)
178695b