bpo-42745: Make the type cache per-interpreter (GH-23947)

Make the type attribute lookup cache per-interpreter.

Add private _PyType_InitCache() function, called by PyInterpreterState_New().

Continue to share next_version_tag between interpreters, since static
types are still shared by interpreters.

Remove MCACHE macro: the cache is no longer disabled if the
EXPERIMENTAL_ISOLATED_SUBINTERPRETERS macro is defined.

Python/pylifecycle.c

@@ -1750,7 +1750,7 @@ Py_FinalizeEx(void)
     _PyImport_Fini();
 
     /* Cleanup typeobject.c's internal caches. */
-    _PyType_Fini();
+    _PyType_Fini(tstate);
 
     /* unload faulthandler module */
     _PyFaulthandler_Fini();