Feat: Upload file UI/UX enhancements (#5359)

### What problem does this PR solve?

Modifies the UX for uploading process on the website.

- Adds option to parse on creation the files
- Adds progress bar to display progress of chunk
- Adds per file feedback on uploading operation

#### Screenshots:

- Show files uploading:

![image](https://github.com/user-attachments/assets/a5693f42-8232-4d5c-a240-20ed343634a5)

- Errors on specific files

![image](https://github.com/user-attachments/assets/986a7f54-ab32-4634-89ab-a098fe1954aa)


### Type of change

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

api/apps/document_app.py

@@ -71,11 +71,13 @@ def upload():
     if not e:
         raise LookupError("Can't find this knowledgebase!")
 
-    err, _ = FileService.upload_document(kb, file_objs, current_user.id)
+    err, files = FileService.upload_document(kb, file_objs, current_user.id)
+    files = [f[0] for f in files] # remove the blob
+    
     if err:
         return get_json_result(
-            data=False, message="\n".join(err), code=settings.RetCode.SERVER_ERROR)
-    return get_json_result(data=True)
+            data=files, message="\n".join(err), code=settings.RetCode.SERVER_ERROR)
+    return get_json_result(data=files)
 
 
 @manager.route('/web_crawl', methods=['POST'])  # noqa: F821