DNM: Defer creation of SimpleCookie objects in the web server until needed

[bdraco]

related issue #2779

We create these objects even if there are no cookies. There are some small performance improvements and some memory savings on each request. Total time spent in the request response was ~24% so it likely works out to a 1% speed up.

[codspeed-hq]

CodSpeed Performance Report

Merging #9895 will not alter performance

_{Comparing web_cookies_lazy (6b63eba) with master (5ab2d47)}

Summary

✅ 25 untouched benchmarks

[codecov]

Codecov Report

Attention: Patch coverage is 87.50000% with 1 line in your changes missing coverage. Please review.

Project coverage is 98.71%. Comparing base (5ab2d47) to head (6b63eba).

✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
aiohttp/helpers.py	87.50%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #9895   +/-   ##
=======================================
  Coverage   98.71%   98.71%           
=======================================
  Files         119      119           
  Lines       36371    36375    +4     
  Branches     4320     4323    +3     
=======================================
+ Hits        35903    35907    +4     
  Misses        315      315           
  Partials      153      153           

Flag	Coverage Δ
CI-GHA	98.60% <87.50%> (+<0.01%)	⬆️
OS-Linux	98.29% <87.50%> (+<0.01%)	⬆️
OS-Windows	96.09% <ø> (ø)
OS-macOS	97.37% <87.50%> (+<0.01%)	⬆️
Py-3.10.11	97.22% <87.50%> (+<0.01%)	⬆️
Py-3.10.15	97.77% <87.50%> (-0.06%)	⬇️
Py-3.11.10	97.82% <87.50%> (+<0.01%)	⬆️
Py-3.11.9	97.26% <87.50%> (-0.01%)	⬇️
Py-3.12.7	98.36% <87.50%> (+<0.01%)	⬆️
Py-3.13.0	98.29% <87.50%> (-0.05%)	⬇️
Py-3.9.13	97.14% <87.50%> (+<0.01%)	⬆️
Py-3.9.20	97.69% <87.50%> (-0.05%)	⬇️
Py-pypy7.3.16	97.30% <87.50%> (-0.01%)	⬇️
VM-macos	97.37% <87.50%> (+<0.01%)	⬆️
VM-ubuntu	98.29% <87.50%> (+<0.01%)	⬆️
VM-windows	96.09% <ø> (ø)

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