Add API authentication to the Flask App

[santanavagner]

Description (Actual Behavior)

The current prototype has no authentication mechanism. However, in order to the solution to be adopted and properly deployed, we need to add an API authentication mechanism following the requirements of our open source license.

Expected Behavior

To allow new users to access an endpoint to generate a key and to users to only perform requests using valid authentication keys.

Possible Fix

The following tutorial may provide a good starting point for us: https://blog.teclado.com/api-key-authentication-with-flask/

Steps to Reproduce

NA

Context

API requests.