Add trailer parsing logic (#11269)

[Dreamsorcerer]

(cherry picked from commit 7dd4b55)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.28%. Comparing base (5f4b36c) to head (eeb8d81).
⚠️ Report is 232 commits behind head on 3.13.

Additional details and impacted files

@@            Coverage Diff             @@
##             3.13   #11286      +/-   ##
==========================================
- Coverage   98.28%   98.28%   -0.01%     
==========================================
  Files         132      132              
  Lines       43578    43574       -4     
  Branches     2388     2387       -1     
==========================================
- Hits        42832    42828       -4     
  Misses        565      565              
  Partials      181      181              

Flag	Coverage Δ
CI-GHA	98.18% <100.00%> (-0.01%)	⬇️
OS-Linux	97.93% <100.00%> (-0.01%)	⬇️
OS-Windows	95.64% <98.18%> (-0.01%)	⬇️
OS-macOS	97.16% <98.18%> (-0.01%)	⬇️
Py-3.10.11	96.82% <98.18%> (+<0.01%)	⬆️
Py-3.10.18	97.30% <100.00%> (-0.01%)	⬇️
Py-3.11.13	97.50% <100.00%> (+<0.01%)	⬆️
Py-3.11.9	97.00% <98.18%> (-0.01%)	⬇️
Py-3.12.10	97.09% <98.18%> (-0.01%)	⬇️
Py-3.12.11	97.59% <100.00%> (-0.01%)	⬇️
Py-3.13.3	97.83% <100.00%> (-0.01%)	⬇️
Py-3.9.13	96.71% <98.18%> (-0.01%)	⬇️
Py-3.9.23	97.19% <100.00%> (-0.01%)	⬇️
Py-pypy7.3.16	90.25% <98.18%> (+0.01%)	⬆️
VM-macos	97.16% <98.18%> (-0.01%)	⬇️
VM-ubuntu	97.93% <100.00%> (-0.01%)	⬇️
VM-windows	95.64% <98.18%> (-0.01%)	⬇️

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[codspeed-hq]

CodSpeed Performance Report

Merging #11286 will not alter performance

_{Comparing patchback/backports/3.13/7dd4b5535e6bf9c2d2f05fde638517bff065ba74/pr-11269 (eeb8d81) with 3.13 (c9b8548)}

Summary

✅ 59 untouched benchmarks