Configure Celery for Certain progress routes

[bryanwong8]

Is your feature request related to a problem? Please describe.
Some progress routes take a while to process, but the user does not need to wait for the response.

Describe the solution you'd like
Make the heavy task async since that would make the User experience a lot better since they don't have to wait for a process finish. Reduce the amount of times the user has to look at a loading screen. We can use celery to make the tasks async.

References

• Use celery to make the tasks async. https://flask.palletsprojects.com/en/1.1.x/patterns/celery/
• Before updating the routes, you need to configure the init.py file in the backend folder
• Routes to change:
  • UnlockHint /activities/<int:activity_id>/hints/<int:hint_id> PUT
  • DeleteActivityProgress /activities/<int:activity_id>/progress DEL
  • JoinClassroom /students/classrooms PUT
  • GradeSubmission /teachers/<int:activity_id>/grade PUT
  • CreateClassroom /classrooms POST
  • UpdateClassroom /classrooms/<int:classroom_id> PUT
  • DeleteClassroom /classrooms/<int:classroom_id> DEL
  • UpdateClassroomModules /classrooms/<int:classroom_id>/modules PUT
    Make sure to test the routes with Postman with the collection: https://documenter.getpostman.com/view/4691925/SzS8uRkd?version=latest