[Request] Add types to router events

[LauraBeatris]

Feature request

Is your feature request related to a problem? Please describe.

It's not related to a problem, although, would be really nice to add types for the Router Events since it would be easier to use without having to refer every time to the documentation.

I think it's an easy enhancement that can improve the developer experience.

Describe the solution you'd like

I would like to have autocompletion for the router events.

Additional context

I added a string literal type for the events, and that's the result: