code: public static DiffSet diffSet(Map<String, Object> introspectionOld, Map<String, Object> introspectionNew) {
          return new DiffSet(introspectionOld, introspectionNew);
      }
docs: Creates a diff set out of the result of 2 introspection queries.
  
  @param introspectionOld the older introspection query
  @param introspectionNew the newer introspection query
  
  @return a diff set representing them