Authentication service

This service is a part of the microservice distributed system for the Runbot application.

TODOs

• [ ] Add tests
• • [ ] Add unit tests
• • • [x] Usecases
• • • [x] Controllers
• • • [ ] Handlers (http, grpc)
• • • [ ] JWT
• • • [ ] Hasher
• • [ ] Add integration tests
• [ ] Add docs
• [x] Fix proto models
• [ ] Add new methods to grpc maybe some day