Add questions route to repopulate with sample data

[Cloud7050]

Add a route to the questions service for development purposes. When GET (such as from the browser), the server deletes all existing questions in Firebase and repopulates it with a clean set of sample questions from the data/questions.json file.

Potentially useful for rapid testing and demo purposes, without fear of messing up our DB contents.

[Cloud7050]

There exists services\question\src\scripts\upload.ts which runs as a script (npm run upload), adding each question asynchronously without clearing existing questions.

• We could use a similar script to achieve the proposed functionality.
• We could also update the script(s) to use the Question in model.ts as they are currently duplicated.

[Cloud7050]

We have been managing thus far by keeping the db very clean during testing. Could bring up in the future if need be.