bpo-44032: Move data stack to thread from FrameObject. (GH-26076)

* Remove 'zombie' frames. We won't need them once we are allocating fixed-size frames.

* Add co_nlocalplus field to code object to avoid recomputing size of locals + frees + cells.

* Move locals, cells and freevars out of frame object into separate memory buffer.

* Use per-threadstate allocated memory chunks for local variables.

* Move globals and builtins from frame object to per-thread stack.

* Move (slow) locals frame object to per-thread stack.

* Move internal frame functions to internal header.

Include/genobject.h

@@ -18,7 +18,7 @@ extern "C" {
     /* Note: gi_frame can be NULL if the generator is "finished" */         \
     PyFrameObject *prefix##_frame;                                          \
     /* The code object backing the generator */                             \
-    PyObject *prefix##_code;                                                \
+    PyCodeObject *prefix##_code;                                                \
     /* List of weak reference. */                                           \
     PyObject *prefix##_weakreflist;                                         \
     /* Name of the generator. */                                            \