RouterLink is missing setRoute(Class<? extends Component> navigationTarget)

[Artur-]

When you create a RouterLink, you can set the navigation target using a class. If you create an empty RouterLink, there is no longer any way to set the navigation target using a class. For some reason you also need a Router reference in this case but not in the first case

[caalador]

Seems like we have that one constructor that uses the internal getRouter() method.
There should be no show stoppers to have a setRoute(Class<? extends Component> navigationTarget) override that would uses the same Router resolving.

[pleku]

Acceptance Criteria

• Add the requested setter method as described above
• Add a unit test
  (I don't see any reason to add a IT test for this)

Please read https://github.com/vaadin/flow/blob/master/CONTRIBUTING.md before contributing.

[torok-peter]

Do we need a setRoute(navigationTarget, parameter) too?

[pleku]

Do we need a setRoute(navigationTarget, parameter) too?

@torok-peter I think it will be useful too and consistent with the constructors.