(WIP) Add baseline Architecture to support auth + User sessions + Basic Auth

[tianjing-li]

Beefy first PR to setup plug & play Auth:

• Adds new auth folder in services

• Adds BaseAuthenticationStrategy abstract class and BasicAuthentication (email+password) to start with. The base class should be inherited from all Auth strategies, next steps should include adding OAuth strategies.

• Adds auth routes, can retrieve session, logout, login, auth (to implement). The /login method should be generic and run for all auth strategies

• Adds SessionMiddleware to track current user session

• Adds extensive unit testing

• [x] Add tests and docs: Please include testing and documentation for your changes

• [x] Lint and test: Run make lint and make run-tests