fix dataset operator (#6064)

Co-authored-by: JzoNg <jzongcode@gmail.com>

api/configs/feature/__init__.py

@@ -396,6 +396,11 @@ class DataSetConfig(BaseSettings):
         default=30,
     )
 
+    DATASET_OPERATOR_ENABLED: bool = Field(
+        description='whether to enable dataset operator',
+        default=False,
+    )
+
 
 class WorkspaceConfig(BaseSettings):
     """