feat: add count_nodes and count_edges methods to GraphDBInterface

cognee/infrastructure/databases/graph/graph_db_interface.py

@@ -159,6 +159,14 @@ class GraphDBInterface(ABC):
     - get_connections
     """
 
+    @abstractmethod
+    async def count_nodes(self) -> int:
+        raise NotImplementedError
+
+    @abstractmethod
+    async def count_edges(self) -> int:
+        raise NotImplementedError
+
     @abstractmethod
     async def query(self, query: str, params: dict) -> List[Any]:
         """