[Feature] Better error handling on /stream

[dartpain]

This is a backend and frontend feature again.

Frontend Part:
Accept error type message in a /stream and print it out in the "something went wrong" message. Most of the stuff that needs to be done is in the /frontend/scr/conversation directory

Backend Part:
Wrap our /stream function to handle error and stream type: "error reason" if something fails there such that frontend can accept it.

Acceptance Criteria

• Scenario: Error handling on /stream
  • Given a user is using the /stream feature
  • When an error occurs during the stream
  • Then the user should see an error message like "error reason"
• Scenario: Backend wraps stream function
  • Given a user is using the /stream feature
  • When an error occurs during the stream
  • Then the backend should wrap the stream function to handle the error and stream type: "error reason"

[sarfarazsiddiquii]

@dartpain, I believe all issues are resolved. Could you please approve the changes and close this issue?
Thank you!