Refactor all the data fetched from endpoint

[yunho7687]

1. In /api/quiz/all_quizzes/{id}/slots, there are no answers along with the questions, which is wrong. In all_quizzes, the answer and solution should be returned.
2. the /api/quiz/all_quizzes/'s name would be better to change to all-quizzes
3. trim the unnecessary data info for non-admin users, like get rid of the visible: true or created_by, etc.

[github-actions]

Branch issue-101-Refactor_all_the_data_fetched_form_endpoint created!

[AarifLamat]

@yunho7687 Was this issue resolved? If not is anyone working on it?