Add SWIG_PyType_GetFullyQualifiedName which is just a wrapper around
PyType_GetFullyQualifiedName, but is only available in python-3.13.
Code up the equivalent for earlier versions - loosely based on the
python-3.13 implementation.
PyType_GetFullyQualifiedName is recommended in PEP-737 for getting the
fully qualified type name of a type.
William S Fulton