Add post quiz request to lambda QuizFunction

[lrboyer]

Adds business logic to quiz lambda for handling a POST request.

Steps for adding quiz info to db:

1. Check if quiz_id exist in quiz_list
   • if not -> add quiz_id to quiz_list
2. Format incoming data for db
3. Insert quiz_info into quiz_progress_table

"last_updated" will be included in test request as a TTL for the data. This way test request expire from the quiz_list and quiz_progress table.