feat(nuxt): support type auto-import

[antfu]

🔗 Linked issue

fix #12808

❓ 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

Currently only adding entries from Vue. /cc @danielroe do you see any other types we could like to auto-import from Nuxt?

📝 Checklist

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

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[danielroe]

Looks great to me. I don't think auto-importing Nuxt types (e.g. NuxtApp) is needed for now, as many of these aren't utility types but for more advanced use-cases. Of course we can revisit if there's a need.