fix: only log unhandled/fatal errors

[danielroe]

🔗 Linked issue

unjs/h3#162

❓ 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

We can use the h3-sourced fatal/unhandled flags to tell us when to log errors.

📝 Checklist

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

[codecov]

Codecov Report

Merging #407 (a71c7d0) into main (e10f130) will not change coverage.
The diff coverage is 66.66%.

@@           Coverage Diff           @@
##             main     #407   +/-   ##
=======================================
  Coverage   56.21%   56.21%           
=======================================
  Files          54       54           
  Lines        3467     3467           
  Branches      367      367           
=======================================
  Hits         1949     1949           
  Misses       1165     1165           
  Partials      353      353           

Impacted Files	Coverage Δ
src/dev/server.ts	15.13% <50.00%> (ø)
src/types/handler.ts	100.00% <100.00%> (ø)

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