[issue35206] Add new experimental _Py_CAPI2 API

[STINNER Victor]

STINNER Victor <vstinner at redhat.com> added the comment:

I previously tried a very similar patch but reusing Py_DEBUG define, rather than adding a new _Py_CAPI2 define: bpo-35199. I abandonned it because it was backward incompatible. This change is backward compatible: the new API is not compatible with the current API, but the change doesn't impact the default API which remains unchanged.

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<https://bugs.python.org/issue35206>
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