refactor(application): move navigation module interface to api package

[kschrab]

Description

• In contrast to other unit module interfaces (e.g. perception or communicatin), the navigation related interfaces INavigationModule and IRoutingModule were misplaced inside the implementation package.
• The interfaces now have been renamed to NavigationModule and RoutingModule and were moved to org.eclipse.mosaic.fed.application.app.api.navigation package to improve consistency.
• The implementation NavigationModule, which implements both interfaces, has been renamed to RoutingNavigationModule, to 1) avoid name clash with the interface, and 2) to make more clear that it implements both interfaces.
• The method retrieveAllValidRoutesToTarget(..) has been removed from NavigationModule interface as it was not used and does also makes no sense from a navigation module point of view, as it is more of a helper method for the CentralNavigationComponent. No replacement is offered, as it was not required in any of our existing models.

Issue(s) related to this PR

• Resolves internal issue 930

Affected parts of the online documentation

Yes, code examples in https://eclipse.dev/mosaic/docs/develop_applications/navigation/ must be adjusted.

Definition of Done

Prerequisites

• You have read CONTRIBUTING.md carefully.
• You have signed the Contributor License Agreement.
• Your GitHub user id is linked with your Eclipse Account.

Required

• The title of this merge request follows the scheme type(scope): description (in the style of Conventional Commits)
• You have assigned a suitable label to this pull request (e.g., enhancement, or bugfix)
• origin/main has been merged into your Fork.
• Coding guidelines have been followed (see CONTRIBUTING.md).
• All checks on GitHub pass.
• All tests on Jenkins pass.

Requested (can be enforced by maintainers)

• New functionality is covered by unit tests or integration tests. Code coverage must not decrease.
• If a bug has been fixed, a new unit test has been written (beforehand) to prove misbehavior
• There are no new SpotBugs warnings.

Special notes to reviewer