[issue46771] Add some form of cancel scopes

[Sam Bull]

Sam Bull <m6f6g7 at sambull.org> added the comment:

> Previously, when the task was cancelled twice, only one CancelledError was raised. Now it would raise a BaseExceptionGroup instead.

I was under the impression that ExceptionGroup was somewhat backwards compatible, in that you could still use `except CancelledError:` and it would catch all the errors in the group. But, maybe I'm wrong, I've not seen the documentation for the final feature yet, but that's the impression I got from the PEP.

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