[issue47143] Add functools.copy_class() which updates closures

[STINNER Victor]

STINNER Victor <vstinner at python.org> added the comment:

> * old fixed attrs issue: https://github.com/python-attrs/attrs/issues/102
> * attrs issue with Python 3.11: https://github.com/python-attrs/attrs/issues/907
> * dataclasses issues with slots=True: https://bugs.python.org/issue46404

Similar bug without attrs nor dataclasses: bpo-29944 "Argumentless super() fails in classes constructed with type()".

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue47143>
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