bpo-42990: Further refactoring of PyEval_ functions. (GH-24368)

* Further refactoring of PyEval_EvalCode and friends. Break into make-frame, and eval-frame parts.

* Simplify function vector call using new _PyEval_Vector.

* Remove unused internal functions: _PyEval_EvalCodeWithName and _PyEval_EvalCode.

* Don't use legacy function PyEval_EvalCodeEx.

Include/eval.h

@@ -18,16 +18,6 @@ PyAPI_FUNC(PyObject *) PyEval_EvalCodeEx(PyObject *co,
                                          PyObject *kwdefs, PyObject *closure);
 
 #ifndef Py_LIMITED_API
-PyAPI_FUNC(PyObject *) _PyEval_EvalCodeWithName(
-    PyObject *co,
-    PyObject *globals, PyObject *locals,
-    PyObject *const *args, Py_ssize_t argcount,
-    PyObject *const *kwnames, PyObject *const *kwargs,
-    Py_ssize_t kwcount, int kwstep,
-    PyObject *const *defs, Py_ssize_t defcount,
-    PyObject *kwdefs, PyObject *closure,
-    PyObject *name, PyObject *qualname);
-
 PyAPI_FUNC(PyObject *) _PyEval_CallTracing(PyObject *func, PyObject *args);
 #endif