feat(agents): provide necessary data structures and changes for agent simulation

[kschrab]

Description

• Receive updates from agents generated by the AgentSimulator and process them in Application Ambassador
• Re-use "RemoveVehicles"-event to remove agent units as well, by renaming it to RemoveUnits.
• Introduce AgentApplication interface to react on agent updates and leg changes.
• Refactoring of AgentRoute.PtLeg and PtRoute.PtLeg so that they share a PtTrip object which contains the information about the pt line and stops on the trip, to to avoid duplicated code and object transformation.
• Visualize agents in WebVisualizer.

Issue(s) related to this PR

• Partly resolves internal issue 975

Affected parts of the online documentation

Not yet.

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