chore: remove unused imports, add optional for delete dataset statement

cognee/infrastructure/databases/dataset_database_handler/dataset_database_handler_interface.py

@@ -68,7 +68,7 @@ class DatasetDatabaseHandlerInterface(ABC):
 
     @classmethod
     @abstractmethod
-    async def delete_dataset(cls, dataset_id: UUID, user: User) -> None:
+    async def delete_dataset(cls, dataset_id: Optional[UUID], user: Optional[User]) -> None:
         """
         Delete the graph or vector database for the given dataset.
         Function should auto handle deleting of the actual database or send a request to the proper service to delete/mark the database as not needed for the given dataset.

cognee/infrastructure/databases/graph/kuzu/KuzuDatasetDatabaseHandler.py

@@ -1,6 +1,3 @@
-import os
-import asyncio
-import requests
 from uuid import UUID
 from typing import Optional