First commit containing the base template for a Flask API

[chouinar]

#3

Reviewed in navapbc/wic-mt-demo-project-mock-api#20

Just copying over the generic version from the above PR. This contains:

• API with a post endpoint that writes to the DB using basic apikey authentication.
• Postgres DB + alembic migrations configured for updating the DB when you update the sqlalchemy DB models.
• Thorough formatting & linting tools.
• Logging, with formatting in both human-readable and JSON formats.
• Ability to write backend scripts connected to the DB with an example one that generates a CSV (locally or on S3 with proper credentials).
• Ability to run the various utility scripts inside or outside of Docker (Note: I may need someone to test the outside as it requires installing a few libraries and/or configuring a few things that I need to document).
• Restructured and improved API request and response error handling which gives more details than the out-of-the-box approach for both Connexion and Pydantic
• Sane environment variable configuration for local development (local.env)

[rocketnova]

One comment. Otherwise LGTM!

[rocketnova]

Let's drop these comments