fix: ensure `bundler` module resolution works with runtime type imports

[danielroe]

🔗 Linked issue

resolves https://github.com/nuxt/content/issues/2469

❓ Type of change

• [ ] 📖 Documentation (updates to the documentation or readme)
• [x] 🐞 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 adds support for Bundler TypeScript module resolution. It changes extensions of runtime dir files to .js which should be safe as this is a type: module project.

I also add a subpath for @nuxt/content/dist/runtime/types as this is already documented. But we could also have a more ergonomic subpath for type augmentation.

📝 Checklist

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

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