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.

[codspeed-hq]

CodSpeed Performance Report

Merging #9895 will improve performances by 17.52%

_{Comparing web_cookies_lazy (8ae15f7) with master (9ca1a58)}

Summary

⚡ 4 improvements
✅ 38 untouched benchmarks

Benchmarks breakdown

	Benchmark	master	web_cookies_lazy	Change
⚡	test_simple_web_response	813.7 µs	727.5 µs	+11.84%
⚡	test_simple_web_stream_response	560.8 µs	477.2 µs	+17.52%
⚡	test_web_response_with_bytes_body	907.6 µs	818.5 µs	+10.88%
⚡	test_web_response_with_text_body	1,037.8 µs	953.4 µs	+8.86%

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.72%. Comparing base (9ca1a58) to head (8ae15f7).
Report is 1 commits behind head on master.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #9895      +/-   ##
==========================================
+ Coverage   98.70%   98.72%   +0.02%     
==========================================
  Files         121      121              
  Lines       36621    36629       +8     
  Branches     4376     4378       +2     
==========================================
+ Hits        36146    36163      +17     
+ Misses        319      314       -5     
+ Partials      156      152       -4     

Flag	Coverage Δ
CI-GHA	98.61% <100.00%> (+0.01%)	⬆️
OS-Linux	98.30% <100.00%> (+0.01%)	⬆️
OS-Windows	96.12% <100.00%> (+0.08%)	⬆️
OS-macOS	97.39% <100.00%> (+<0.01%)	⬆️
Py-3.10.11	97.24% <100.00%> (+<0.01%)	⬆️
Py-3.10.15	97.84% <100.00%> (+0.05%)	⬆️
Py-3.11.10	97.83% <100.00%> (+<0.01%)	⬆️
Py-3.11.9	97.29% <100.00%> (+<0.01%)	⬆️
Py-3.12.7	98.32% <100.00%> (-0.04%)	⬇️
Py-3.13.0	98.35% <100.00%> (-0.01%)	⬇️
Py-3.9.13	97.17% <100.00%> (+0.30%)	⬆️
Py-3.9.20	97.71% <100.00%> (+0.70%)	⬆️
Py-pypy7.3.16	97.32% <100.00%> (?)
VM-macos	97.39% <100.00%> (+<0.01%)	⬆️
VM-ubuntu	98.30% <100.00%> (+0.01%)	⬆️
VM-windows	96.12% <100.00%> (+0.08%)	⬆️

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[bdraco]

Todo

• Focused benchmarks for creating web Responses and StreamResponses as we only have visibility on the more macro benchmark here
• Add test coverage for overriding an already set cookie

[bdraco]

This was unreachable since cookies are always set with a path