feat(http/unstable): implement problem details (RFC 9457)

[tomas-zijdemans]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.72%. Comparing base (030ac5c) to head (f7c1aa9).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7033      +/-   ##
==========================================
- Coverage   93.73%   93.72%   -0.02%     
==========================================
  Files         620      621       +1     
  Lines       49396    49475      +79     
  Branches     8653     8681      +28     
==========================================
+ Hits        46303    46368      +65     
+ Misses       3024     2516     -508     
- Partials       69      591     +522     

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