symphony/utils: use __qualname__ to store object type in toJSON

Use __qualname__ instead of __name__, since __qualname__ also works with
nested classes.

symphony/utils/simbricks/utils/base.py

@@ -38,7 +38,7 @@ class IdObj(abc.ABC):
 
     def toJSON(self):
         json_obj = {}
-        json_obj["type"] = self.__class__.__name__
+        json_obj["type"] = self.__class__.__qualname__
         json_obj["module"] = self.__class__.__module__
         json_obj["id"] = self._id
         return json_obj