feat: add Microsoft Entra ID integration

- Updated .env-template and settings.py for Microsoft Entra ID configuration.
- Enhanced ConnectorsCallback to support SharePoint authentication.
- Introduced SharePointAuth and SharePointLoader classes.
- Added required dependencies in requirements.txt.

application/parser/connectors/share_point/loader.py

@@ -0,0 +1,44 @@
+from typing import List, Dict, Any
+from application.parser.connectors.base import BaseConnectorLoader
+from application.parser.schema.base import Document
+
+
+class SharePointLoader(BaseConnectorLoader):
+    def __init__(self, session_token: str):
+        pass
+
+    def load_data(self, inputs: Dict[str, Any]) -> List[Document]:
+        """
+        Load documents from the external knowledge base.
+
+        Args:
+            inputs: Configuration dictionary containing:
+                - file_ids: Optional list of specific file IDs to load
+                - folder_ids: Optional list of folder IDs to browse/download
+                - limit: Maximum number of items to return
+                - list_only: If True, return metadata without content
+                - recursive: Whether to recursively process folders
+
+        Returns:
+            List of Document objects
+        """
+        pass
+
+    def download_to_directory(self, local_dir: str, source_config: Dict[str, Any] = None) -> Dict[str, Any]:
+        """
+        Download files/folders to a local directory.
+
+        Args:
+            local_dir: Local directory path to download files to
+            source_config: Configuration for what to download
+
+        Returns:
+            Dictionary containing download results:
+                - files_downloaded: Number of files downloaded
+                - directory_path: Path where files were downloaded
+                - empty_result: Whether no files were downloaded
+                - source_type: Type of connector
+                - config_used: Configuration that was used
+                - error: Error message if download failed (optional)
+        """
+        pass