turn CsstDAGs to dict

csst_dag/dag/__init__.py

@@ -26,12 +26,3 @@ class CsstDAGs(dict):
     @staticmethod
     def ls():
         print(DAG_LIST.keys())
-
-    @staticmethod
-    def get_dag(self, dag: str = ""):
-        assert dag in DAG_LIST, f"{dag} not in DAG_LIST"
-        return self.get(dag, None)
-
-    @staticmethod
-    def get_all(self):
-        return set(self.keys())