[Sonata-Profiles-2] Add postgresql integration for project

[justJavaProgrammer]

Add PostgreSQL database to the project. User profiles must be fetched from the database instead of mocked values. Add tests

Acceptance criteria:

• Sonata-Profiles project has integration with PostgreSQL
• User's profile is fetched from the database
• Code is covered with tests
• All tests pass, and the application runs successfully.

[justJavaProgrammer]

Implemented in https://github.com/Project-Sonata/Profiles/pull/6