gh-101659: Add _Py_AtExit()#103298
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gh-101659: Add _Py_AtExit() #103298
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The function is like
Py_AtExit()but for a single interpreter. This is a companion to the atexit module'sregister()function, taking a C callback instead of a Python one.We also update the _xxinterpchannels module to use
_Py_AtExit(), which is the motivating case. (This is based on pain points while working on gh-101660.)