[issue17013] Allow waiting on a mock

[Ilya Kulakov]

Ilya Kulakov <kulakov.ilya at gmail.com> added the comment:

As far as I understand it introduces 3 methods that may clash. It's unlikely but (I speculate)
is still more likely than an identity check with called.

That being said, the PR can be redone as a subclass. But that implementation will not play
as nicely with the planned `awaited` property for asyncio mocks (see description in the PR).

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