bpo-45963: Make space for the InterpreterFrame of a generator in that generator. (GH-29891)

* Make generator, coroutine and async gen structs all the same size.

* Store interpreter frame in generator (and coroutine). Reduces the number of allocations neeeded for a generator from two to one.

Include/internal/pycore_ceval.h

@@ -113,7 +113,7 @@ static inline void _Py_LeaveRecursiveCall_inline(void)  {
 
 struct _interpreter_frame *_PyEval_GetFrame(void);
 
-PyObject *_Py_MakeCoro(PyFunctionObject *func, struct _interpreter_frame *);
+PyObject *_Py_MakeCoro(PyFunctionObject *func);
 
 #ifdef __cplusplus
 }