feat: make typed useRoute(currentRouteName) return children route types as well

[Anoesj]

In an app (with a typed router) where route /a/b is a child of route /a, this makes useRoute('/a') return RouteLocationNormalizedLoadedTyped<RouteNamedMap, "/a"> | RouteLocationNormalizedLoadedTyped<RouteNamedMap, "/a/b">.

It works in a recursive manner, so whenever route /a/b/c is added as a child of /a/b, useRoute('/a') will return RouteLocationNormalizedLoadedTyped<RouteNamedMap, "/a"> | RouteLocationNormalizedLoadedTyped<RouteNamedMap, "/a/b"> | RouteLocationNormalizedLoadedTyped<RouteNamedMap, "/a/b/c">`.

Of course useRoute('/a/b/c') will only return RouteLocationNormalizedLoadedTyped<RouteNamedMap, "/a/b/c">.

Note

This PR is intended to be paired with the following unplugin-vue-router PR: posva/unplugin-vue-router#602
That PR changes the DTS generation to include RouteMeta and a union of the children route's names as generics to every RouteRecordInfo type.

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