[issue46771] Add some form of cancel scopes

[Yury Selivanov]

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

Couple thoughts:

I'm +1 for adding TaskGroup.cancel() method.

I'd be -1 on abusing `Task.cancel()` to signal something with a nonce. Whatever problem we are trying to solve here, it should be solvable without resorting to hacks like this. It should be trivial to implement simple tracking of whether a child task was cancelled by the group or not to decide on how to handle a rogue CancelledError.

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