Fix notification module

See merge request !40

feat: send request to visualization if getDriver is called

See merge request !39

added tests for application module and added more integration tests in core module

See merge request !38

feat(Sending notification): Implemented func to send request to notification-module

See merge request !37

Validation

See merge request !36

fix(Service tests): mocked repository return Optional.empty() instead of throwing exception

See merge request !35

Added getAllCars - pageable

See merge request !34

Department service tests

See merge request !33

# Conflicts:
#   core/src/test/java/cz/muni/pa165/rest/CarComponentControllerTest.java

Test Controller fix - CarComponent

See merge request !32