refactor: for route state prefer events over v-model

[schogges]

In #1966 a watcher has been added to sync boolean query search params. This watcher caused some issues in nested routes due to a race condition as described in #3409.

The reason for the watcher (from #1966)

Whilst I'd prefer not use two way binding models we have some components that we use that uses these as required values, such as KInputSwitch

Turns out that the components KSelect and KCheckBox now support the @change events. When used alongside the :model-value we have our getter and setter separated. This means that we can remove the additional watcher.

From #3409

4. I had to keep the watcher with the booleans only for the case of KInputSwitch.

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[johncowen]

LGTM! I left one comment about point 5 in the docs, but I'm easy either way.