fix: build nuxt module using `@nuxt/module-builder`

🔗 Linked issue

❓ Type of change

[ ] 📖 Documentation (updates to the documentation, readme or JSDoc annotations)
[ ] 🐞 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)
[x] 🧹 Chore (updates to the build process or auxiliary tools and libraries)
[ ] ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

Using @nuxt/module-builder will prevent our types from breaking other modules (ref https://github.com/nuxt/nuxt/issues/28672). The changes in this PR are a bit messy, I think a good followup would be to split up the Vue plugin and Nuxt module in a packages directory.

📝 Checklist

[ ] I have linked an issue or discussion.
[ ] I have added tests (if possible).
[ ] I have updated the documentation accordingly.

vueuse / motion

fix: build nuxt module using `@nuxt/module-builder` #224

🔗 Linked issue

❓ Type of change

📚 Description

📝 Checklist