[labs/router] Extend lit-router to support hash-based routing

[maischus]

lit-router currently only uses the pathname to perform the routing. This change extends the routing to search and hash part of an URL.

This should fix lit/lit#3517 and allow urlpattern-polyfill to work correctly (kenchris/urlpattern-polyfill#129) for hash-based routing.

@justinfagnani What are your thoughts on this approach? tailGroup has not been adapted yet. I would like to wait for your thoughts before continuing.

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[xseman]

Hey, I'd like to help with this. If the author isn't active, I'd be happy to continue implement the feature