gh-81057: Move PyImport_Inittab to _PyRuntimeState #99402
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ericsnowcurrently requested review from brettcannon, encukou, ncoghlan and warsaw as code owners 
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We actually don't move
PyImport_Inittab. Instead, we make a copy that we keep on_PyRuntimeStateand use only that afterPy_Initialize(). We also prevent folks from modifyingPyImport_Inittab(the best we can) after that point.