⚡ perf: Improve usage of sync.Pool

[gaby]

Summary

• Add support for using sync.Pool across code base
• Validate release of objects put in the pools

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✨ Finishing touches

🧪 Generate unit tests

• [ ] Create PR with unit tests
• [ ] Post copyable unit tests in a comment
• [ ] Commit unit tests in branch review-and-optimize-sync.pool-usage

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[gaby]

/gemini review

[codecov[bot]]

Codecov Report

:x: Patch coverage is 72.54237% with 405 lines in your changes missing coverage. Please review. :white_check_mark: Project coverage is 89.43%. Comparing base (b25339d) to head (98f436a). :warning: Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
helpers.go	69.84%	50 Missing and 26 partials :warning:
middleware/logger/tags.go	57.31%	25 Missing and 10 partials :warning:
binder/binder.go	46.15%	18 Missing and 10 partials :warning:
redirect.go	67.53%	15 Missing and 10 partials :warning:
res.go	72.82%	14 Missing and 11 partials :warning:
client/cookiejar.go	77.01%	13 Missing and 7 partials :warning:
client/request.go	80.95%	11 Missing and 9 partials :warning:
state.go	65.21%	9 Missing and 7 partials :warning:
req.go	85.71%	9 Missing and 6 partials :warning:
middleware/idempotency/response.go	67.44%	9 Missing and 5 partials :warning:
... and 17 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3767      +/-   ##
==========================================
- Coverage   91.70%   89.43%   -2.27%     
==========================================
  Files         113      114       +1     
  Lines       11940    13177    +1237     
==========================================
+ Hits        10949    11785     +836     
- Misses        728      976     +248     
- Partials      263      416     +153     

Flag	Coverage Δ
unittests	89.43% <72.54%> (-2.27%)	:arrow_down:

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[gaby]

/gemini review