[issue32309] Implement asyncio.run_in_executor shortcut

[STINNER Victor]

STINNER Victor <vstinner at python.org> added the comment:

Note for myself: Python 3.9 release manager (Lukasz) approved adding the feature to Python 3.9.0 beta2:
https://github.com/python/cpython/pull/20212#pullrequestreview-414278938

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nosy: +vstinner
versions: +Python 3.9 -Python 3.7

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