Add features on GUI to add first name, last name to account

[vvmurthy]

Currently, users cannot add their first or last name to their account using the online GUI.

Add a settings tab once users log in as an option on a dropdown menu under their username. When clicked on this tab, it should redirect them to be able to set a valid first and last name.

First, implement this as Python backend API calls. Then wire in the API calls to the frontend.

Tests for this code

• Alphanumeric characters only
• Ensure names with accents can be entered
• No empty names
• Max length of names defined in auth_users VARCHAR limit