fix: read chunked body

[aaharu]

🔗 Linked issue

resolve https://github.com/unjs/h3/issues/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)
• [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)
• [ ] 🧹 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

• [x] I have linked an issue or discussion.
• [x] 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.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 79.43%. Comparing base (a58d7c9) to head (077ec8c). Report is 79 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #652      +/-   ##
==========================================
+ Coverage   77.83%   79.43%   +1.59%     
==========================================
  Files          47       54       +7     
  Lines        4286     5334    +1048     
  Branches      611      678      +67     
==========================================
+ Hits         3336     4237     +901     
- Misses        933     1078     +145     
- Partials       17       19       +2     

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