Allow specifying query parameters when forwarding or rerouting

[OlliTietavainenVaadin]

V14.1.17
Currently, when you use rerouteTo or forwardTo, original query parameters should be retained. However, in some cases it would be useful to be able to provide a custom set of query parameters when rerouting or forwarding; e.g. after logging in, in a beforeEnter listener.

[knoobie]

Workaround by @TatuLund from discord discussion:

Currently the workaround is to use afterNavigation, and ui.navigate ... Here is an example https://github.com/TatuLund/devday-demo-flow/blob/master/src/main/java/com/vaadin/devday/demo/views/LoginView.java#L80 In this use case I am using ui.navigate without any parameters, since I do not want them to be shown.

[mshabarov]

Should be re-checked agains #17407, this might have been already addressed there.

[caalador]

In combination with #17659 I would say the feature is fully addressed.