feat(kit): add more specific typings for schema

[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

This PR:

• adds some more specific types for the nuxt config schema
• moves resolution handling for components and meta -> schema

📝 Checklist

• fix: improve custom tsType handling unjs/untyped#25
• feat!: extract top-level type imports unjs/untyped#26
• I have linked an issue or discussion.
• I have updated the documentation accordingly.

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