gh-93937, C API: Move PyFrame_GetBack() to Python.h (#93938)

Move the follow functions and type from frameobject.h to pyframe.h,
so the standard <Python.h> provide frame getter functions:

* PyFrame_Check()
* PyFrame_GetBack()
* PyFrame_GetBuiltins()
* PyFrame_GetGenerator()
* PyFrame_GetGlobals()
* PyFrame_GetLasti()
* PyFrame_GetLocals()
* PyFrame_Type

Remove #include "frameobject.h" from many C files. It's no longer
needed.

Python/_warnings.c

@@ -4,7 +4,6 @@
 #include "pycore_long.h"          // _PyLong_GetZero()
 #include "pycore_pyerrors.h"
 #include "pycore_pystate.h"       // _PyThreadState_GET()
-#include "frameobject.h"          // PyFrame_GetBack()
 #include "pycore_frame.h"
 #include "clinic/_warnings.c.h"
 

Python/ceval.c

@@ -28,7 +28,6 @@
 
 #include "pycore_dict.h"
 #include "dictobject.h"
-#include "frameobject.h"
 #include "pycore_frame.h"
 #include "opcode.h"
 #include "pydtrace.h"

Python/frame.c

@@ -3,7 +3,7 @@
 
 #include "Python.h"
 #include "frameobject.h"
-#include "pycore_code.h"           // stats
+#include "pycore_code.h"          // stats
 #include "pycore_frame.h"
 #include "pycore_object.h"        // _PyObject_GC_UNTRACK()
 #include "opcode.h"

Python/suggestions.c

@@ -1,5 +1,4 @@
 #include "Python.h"
-#include "frameobject.h"
 #include "pycore_frame.h"
 
 #include "pycore_pyerrors.h"

Python/sysmodule.c

@@ -31,7 +31,7 @@ Data members:
 #include "pycore_structseq.h"     // _PyStructSequence_InitType()
 #include "pycore_tuple.h"         // _PyTuple_FromArray()
 
-#include "frameobject.h"          // PyFrame_GetBack()
+#include "frameobject.h"          // PyFrame_FastToLocalsWithError()
 #include "pydtrace.h"
 #include "osdefs.h"               // DELIM
 #include "stdlib_module_names.h"  // _Py_stdlib_module_names

Python/traceback.c

@@ -3,7 +3,6 @@
 
 #include "Python.h"
 
-#include "frameobject.h"          // PyFrame_GetBack()
 #include "pycore_ast.h"           // asdl_seq_*
 #include "pycore_call.h"          // _PyObject_CallMethodFormat()
 #include "pycore_compile.h"       // _PyAST_Optimize
@@ -15,7 +14,9 @@
 #include "pycore_pyerrors.h"      // _PyErr_Fetch()
 #include "pycore_pystate.h"       // _PyThreadState_GET()
 #include "pycore_traceback.h"     // EXCEPTION_TB_HEADER
+
 #include "../Parser/pegen.h"      // _PyPegen_byte_offset_to_character_offset()
+#include "frameobject.h"          // PyFrame_New()
 #include "structmember.h"         // PyMemberDef
 #include "osdefs.h"               // SEP
 #ifdef HAVE_FCNTL_H