enh: delete_message, continue_response, regenerate_response, rate_response user permissions

Co-Authored-By: G30 <50341825+silentoplayz@users.noreply.github.com>

backend/open_webui/routers/users.py

@@ -146,6 +146,10 @@ class ChatPermissions(BaseModel):
     params: bool = True
     file_upload: bool = True
     delete: bool = True
+    delete_message: bool = True
+    continue_response: bool = True
+    regenerate_response: bool = True
+    rate_response: bool = True
     edit: bool = True
     share: bool = True
     export: bool = True