Revert "Cleanup of code"

lightrag/base.py

@@ -198,6 +198,10 @@ class BaseGraphStorage(StorageNameSpace, ABC):
     ) -> tuple[np.ndarray[Any, Any], list[str]]:
         """Get all labels in the graph."""
 
+    @abstractmethod
+    async def get_all_labels(self) -> list[str]:
+        """Get a knowledge graph of a node."""
+
     @abstractmethod
     async def get_knowledge_graph(
         self, node_label: str, max_depth: int = 5