Add created_at and updated_at fields to Quiz model; update queryset o…

[yunho7687]

Change Summary

add new fields to the Quiz model and create a migration file
update querysets in various viewsets to order by the new created_at field.

Changes to Quiz model:

• Added created_at and updated_at fields to the Quiz model in server/api/quiz/models.py to track the creation and update timestamps.

Database migration:

• Created a migration file 0011_quiz_created_at_quiz_updated_at.py to add the created_at and updated_at fields to the Quiz model in the database.

Updates to viewsets:

• Updated AdminQuizViewSet in server/api/quiz/views.py to order quizzes by created_at in descending order.
• Updated QuizViewSet in server/api/quiz/views.py to order quizzes by created_at in descending order for quizzes with status 0 and visible.
• Updated CompetitionQuizViewSet in server/api/quiz/views.py to order quizzes by created_at in descending order for quizzes with status 1 and visible.

Related issue

• Resolve Bug Competition Get Data #145

[loklokyx]

Looks good to me thanks