feat(kit,nuxi): add writeTypes utility

[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)
• 🧹 Chore (updates to the build process or auxiliary tools and libraries)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

This moves the creation/curation of core nuxt tsconfig.json out of nuxi and into @nuxt/kit. This will be important as we continue development on https://github.com/nuxt/cli to ensure we keep types in sync across the cli projects. Also, tsconfig changes are more tied to nuxt version, not nuxi version.

At the moment this PR uses kit implementation in preference if it exists, as well as inlining the current implementation from kit. We could add a deprecation and suggest updating kit/nuxt version if it's missing writeTypes, and then later remove this. Thoughts @pi0?

📝 Checklist

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

[stackblitz]

Run & review this pull request in StackBlitz Codeflow.

[pi0]

💯