Port to Quart

[pamelafox]

Purpose

This PR ports the app from Flask to Quart, the asynchronous version of Flask. This is to align with best practices of allowing concurrency.

Does this introduce a breaking change?

[ ] Yes
[X] No

Pull Request Type

What kind of change does this Pull Request introduce?

[ ] Bugfix
[X] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Documentation content changes
[ ] Other... Please describe:

How to Test

• python3 -m pytest
• test local server
• azd up and test prod