Optimize methoddescr_call(): avoid temporary PyCFunction

Issue #29259, #29263. methoddescr_call() creates a PyCFunction object, call it
and the destroy it. Add a new _PyMethodDef_RawFastCallDict() method to avoid
the temporary PyCFunction object.

Include/methodobject.h

@@ -95,6 +95,13 @@ typedef struct {
     PyObject    *m_module; /* The __module__ attribute, can be anything */
     PyObject    *m_weakreflist; /* List of weak references */
 } PyCFunctionObject;
+
+PyAPI_FUNC(PyObject *) _PyMethodDef_RawFastCallDict(
+    PyMethodDef *method,
+    PyObject *self,
+    PyObject **args,
+    Py_ssize_t nargs,
+    PyObject *kwargs);
 #endif
 
 PyAPI_FUNC(int) PyCFunction_ClearFreeList(void);