fix: read chunked body

[aaharu]

🔗 Linked issue

resolve #651

And SuperTest can not successfully test the request with chunked body, so I rewrote the body test using undici.

❓ 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

https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Transfer-Encoding

📝 Checklist

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

[aaharu]

I think this is a bug in h3.
I am not having trouble with this issue, but I think it should be fixed.