Add `isRoute` type guard with `exact` option

[pleek91]

Description

The current route can be type guarded using useRoute('route.key'). Adding and isRoute type guard so that any value can be type guarded to determine A. If it is a RouterRoute B. Which user defined route it is

This allows for this type of logic

const route = useRoute()

if(isRoute(route, 'settings') {
  // do settings logic
}

if(isRoute(route, 'home') {
  // do home logic
}

There is also an optional 3rd argument for options where the exact option can be passed. Passing this settings means that if the current route is settings.foo then isRoute(route, 'settings', { exact: true }) will return false.

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