feat(nuxt): typed router

[danielroe]

❓ Type of change

• [ ] 📖 Documentation (updates to the documentation or readme)
• [ ] 🐞 Bug fix (a non-breaking change that fixes an issue)
• [x] 👌 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

This PR is a prerelease integration of the new typed-routes feature in vue-router, for testing purposes. (cc: @posva)

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[danielroe]

Closing as vue-router is no longer exposing these types. Instead we'll follow progress on https://github.com/posva/unplugin-vue-router and will hopefully open another one in future.