Completed several Authentication related features/functionalities.

[omzmarlon]

• Added Authentication.proto and generated protobuf code
• Added ProtobufUtil for protobuf parsing
• Added basic Login and create account routes and controller endpoints
• Added SQL script to create User table
• Added UserAsyncDAO. This class will talk to slick/SQL and make all the DB transactions
• Added slick UserTable and mapped User case class
• Added a couple of service classes providing decoupled functionalities necessary to the application
• Added AuthenticatedRequest class (this represents requests that have been authenticated)
• Added AuthenticatedAction (this action will perform the authentication of incoming requests, and return 403 if authentication failed)
• Left a few TODOs that we will need to address in future commits

[tomyang729]

Great work 👍 I like the way you wrap the authenticated actions and create the db query helper function execute

[omzmarlon]

憋了好久才写出点能看的code😂