Move Document and other interface into base/schema (#69)

knowledgehub/docstores/base.py

@@ -2,7 +2,7 @@ from abc import ABC, abstractmethod
 from pathlib import Path
 from typing import List, Optional, Union
 
-from ..documents.base import Document
+from ..base import Document
 
 
 class BaseDocumentStore(ABC):

knowledgehub/docstores/in_memory.py

@@ -2,7 +2,7 @@ import json
 from pathlib import Path
 from typing import List, Optional, Union
 
-from ..documents.base import Document
+from ..base import Document
 from .base import BaseDocumentStore