Refactor TestController

[isalzh]

Description:

1. Rename controller to TestCardController or something more meaningful.
2. Implement all required logic in the TestCardService for getting/persisting required data from data layer.
3. Move all business-sensitive logic to BL;
4. Create independent data models for particular service;
5. Do not expose any DAL model to Web layer;
6. Cover BL service with unit tests.

Acceptance Criteria:

TestCardController must not contain any /Data (Repository, ApplicationDbContext, ...) dependency