Improve HTTPError to include response text and JSON

[NEKOYASAN]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.55%. Comparing base (cf29943) to head (70dbc16).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #11   +/-   ##
=======================================
  Coverage   92.55%   92.55%           
=======================================
  Files           5        5           
  Lines         349      349           
  Branches      121      121           
=======================================
  Hits          323      323           
  Misses          2        2           
  Partials       24       24           

Flag	Coverage Δ
generator	92.55% <ø> (ø)

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