[issue46771] Add some form of cancel scopes

[Guido van Rossum]

Guido van Rossum <guido at python.org> added the comment:

Sure, we should create the best possible solution.

We have no CI in the stdlib that checks type annotations, so those should probably be moved to a stub file in typeshed. (Ditto for asyncio taskgroups.py.)

Using the new .cancelling()/.uncancel() API added to Task you might be able to avoid hacks using the cancel msg (check how it's used in the new TaskGroup).

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<https://bugs.python.org/issue46771>
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