feat(api): Implement `version` method in `parameter_extractor_node` and raise NotImplementedError in `BaseNode`

api/core/workflow/nodes/base/node.py

@@ -178,7 +178,7 @@ class BaseNode(Generic[GenericNodeData]):
         #
         # If you have introduced a new node type, please add it to `NODE_TYPE_CLASSES_MAPPING`
         # in `api/core/workflow/nodes/__init__.py`.
-        pass
+        raise NotImplementedError("subclasses of BaseNode must implement `version` method.")
 
     @property
     def should_continue_on_error(self) -> bool:

api/core/workflow/nodes/parameter_extractor/parameter_extractor_node.py

@@ -109,6 +109,10 @@ class ParameterExtractorNode(BaseNode):
             }
         }
 
+    @classmethod
+    def version(cls) -> str:
+        return "1"
+
     def _run(self):
         """
         Run the node.