gh-102304: Move the Total Refcount to PyInterpreterState (gh-102545)

Moving it valuable with a per-interpreter GIL.  However, it is also useful without one, since it allows us to identify refleaks within a single interpreter or where references are escaping an interpreter.  This becomes more important as we move the obmalloc state to PyInterpreterState.

https://github.com/python/cpython/issues/102304

Python/sysmodule.c

@@ -1854,6 +1854,8 @@ static Py_ssize_t
 sys_gettotalrefcount_impl(PyObject *module)
 /*[clinic end generated code: output=4103886cf17c25bc input=53b744faa5d2e4f6]*/
 {
+    /* It may make sense to return the total for the current interpreter
+       or have a second function that does so. */
     return _Py_GetGlobalRefTotal();
 }