tests/cpydiff: Test for PEP487 __init_subclass__.

This commit documents and verifies the current absence of
`__init_subclass__` functionality, in anticipation of a possible future
PEP487 'metaclasses lite' patch.

The main `core_class_initsubclass.py` test verifies if the method is
automatically called, while the other three verify other orthogonal
properties it should have: if the method is an implicit classmethod; if
MicroPython supplies the base case for the usual recursive function body
the PEP encourages; and if kwargs inheritance parameters work correctly.

Signed-off-by: Anson Mansfield <amansfield@mantaro.com>

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