gh-90868: Adjust the Generated Objects (gh-99223)

We do the following:

* move the generated _PyUnicode_InitStaticStrings() to its own file
* move the generated _PyStaticObjects_CheckRefcnt() to its own file
* include pycore_global_objects.h in extension modules instead of pycore_runtime_init.h

These changes help us avoid including things that aren't needed.

https://github.com/python/cpython/issues/90868

Python/suggestions.c

@@ -1,6 +1,7 @@
 #include "Python.h"
 #include "pycore_frame.h"
-#include "pycore_runtime_init.h"  // _Py_ID()
+#include "pycore_runtime.h"         // _PyRuntime
+#include "pycore_global_objects.h"  // _Py_ID()
 
 #include "pycore_pyerrors.h"
 #include "pycore_code.h"        // _PyCode_GetVarnames()