[issue42039] Add gc.track and gc.untrack

[Inada Naoki]

Inada Naoki <songofacandy at gmail.com> added the comment:

I meant this: https://github.com/python/cpython/blob/b67cbbda3a022cec5e2ad929f0531162166e7c8d/Include/internal/pycore_object.h#L75-L78

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