feat: twoslash support

[cpreston321]

🔗 Linked issue

❓ Type of change

• 📖 Documentation (updates to the documentation, readme, or JSdoc annotations)
• 🐞 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

Preview: https://feat-twoslash.undocs.pages.dev/guide/content-transformation#twoslash-code-blocks

This just a reference PR on how to enable it currently so we can test the waters.

📝 Checklist

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

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[pi0]

thanks for work on this. i think it would be a good addition but considering that this tool is still not stable and I'm trying to reduce stack size (#51), i would wait until changes (basically content layer rewrite) happen before considering twoslash support to make the migration easier.