bpo-40133: Add unittest.mock.matchers with additional matching classes

[Flameeyes]

https://bugs.python.org/issue40133

[the-knights-who-say-ni]

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[Flameeyes]

FTR the code is coming from Google, who already has a signed CLA for it.

I will be able to sign my individual CLA this coming Saturday, for any follow up.

[csabella]

@Flameeyes, thank you for the suggestion and for the contribution. As per the comments on the bug tracker issue, I'm going to close this as it would be better suited to a PyPI package. It can be reopened if additional discussion makes this a suitable addition to the standard library. Thanks!

[gpshead]

see the bug.

[csabella]

Thanks, @gpshead! :-)

[cjw296]

@gpshead - please don't merge this without further discussion on the bug.

[gpshead]

mock's owners don't want these features as is. We can create a new PR for the subset of things that make sense if any.