[319] NestJS configure services and repositories layer

[danielordaan]

Current state Controllers are currently directly talking to the daos.

Expected state A services and repositories layer are added. Business logic is handled by services. These are injectable into (all) controllers. Repositories handle all logic associated with the interaction with the database (like the daos did). These are also injectable.

TO DO

• [x] Add services for each controller
• [x] Transfer logic from daos to repositories
• [x] Initiate typeorm configuration in root module

Necessities

317

Branch 316-nestjs-refactor