add task_id for python tasks as well

lm_eval/tasks/__init__.py

@@ -256,6 +256,8 @@ class TaskManager:
             group_name: dict(collections.ChainMap(*map(fn, reversed(subtask_list))))
         }
 
+    def build_tasks
+    
     def load_task_or_group(self, task_list: Optional[Union[str, list]] = None) -> dict:
         """Loads a dictionary of task objects from a list