feat!: use native vue-router composables

[danielroe]

🔗 Linked issue

❓ Type of change

• 📖 Documentation (updates to the documentation or readme)
• 🐞 Bug fix (a non-breaking change that fixes an issue)
• 👌 Enhancement (improving an existing functionality like performance)
• ✨ New feature (a non-breaking change that adds functionality)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

With the release of the latest vue-router, we now have access to vue-router composables for:

• useRoute
• onBeforeRouteLeave
• onBeforeRouteUpdate
• useLink
• useRouter

This PR implements them as auto-imports and removes our own custom implementation of useRoute and useRouter

👉 Migration

If you were importing useRoute and useRouter from #app you should update to import them from #imports instead.

📝 Checklist

• I have linked an issue or discussion.
• I have updated the documentation accordingly.