[issue34616] implement "Async exec"

[Yury Selivanov]

Yury Selivanov <yselivanov at gmail.com> added the comment:

> And I'm guessing you will collect what's in NEWS.d ? Otherwise I'm happy to contribute some text. let me know the best way.

Would be great if you could make a PR to add an entry to whatsnew/3.8.rst (as Victor suggests)

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<https://bugs.python.org/issue34616>
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