chore: use module-builder stub mode for more accurate types

[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

We added a prepare command for nuxt-module-build which allows creating type stubs directly from the module without needing to apply to the playground as well. (nuxt/module-builder#124)

It's the default for new modules (nuxt/starter#392).

This should allow us to match types more appropriately for module authors (for example, disallowing auto-imports) in future.

Note: I've not updated the root tsconfig.json but you could now extend it from .nuxt/tsconfig.json

📝 Checklist

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