[issue26988] Add AutoNumberedEnum to stdlib

[STINNER Victor]

STINNER Victor added the comment:

> Raymond, what are your thoughts about the version of AutoEnum that requires that a bare tuple be used as the value.  It has been in the Python docs since 3.4 and was actually the original request of this issue: https://docs.python.org/library/enum.html#autonumber

Well, I suggest to keep it as a recipe in the doc ;-)

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