bpo-45439: Move _PyObject_CallNoArgs() to pycore_call.h (GH-28895)

* Move _PyObject_CallNoArgs() to pycore_call.h (internal C API).
* _ssl, _sqlite and _testcapi extensions now call the public
  PyObject_CallNoArgs() function, rather than _PyObject_CallNoArgs().
* _lsprof extension is now built with Py_BUILD_CORE_MODULE macro
  defined to get access to internal _PyObject_CallNoArgs().

Objects/iterobject.c

@@ -1,7 +1,8 @@
 /* Iterator objects */
 
 #include "Python.h"
-#include "pycore_object.h"
+#include "pycore_call.h"          // _PyObject_CallNoArgs()
+#include "pycore_object.h"        // _PyObject_GC_TRACK()
 
 typedef struct {
     PyObject_HEAD