Feat: add advanced document filter (#8723)

### What problem does this PR solve?

Add advanced document filter

### Type of change

- [x] New Feature (non-breaking change which adds functionality)

api/apps/file2document_app.py

@@ -14,6 +14,8 @@
 #  limitations under the License
 #
 
+from pathlib import Path
+
 from api.db.services.file2document_service import File2DocumentService
 from api.db.services.file_service import FileService
 
@@ -82,6 +84,7 @@ def convert():
                         "created_by": current_user.id,
                         "type": file.type,
                         "name": file.name,
+                        "suffix": Path(file.name).suffix.lstrip("."),
                         "location": file.location,
                         "size": file.size
                     })