Avoid memory copy in the WebSocket reader for small payloads

[bdraco]

Only convert to bytearray when we know we are going to append messages or unmask. If the message comes in without being fragmented, we can avoid many conversions from bytes to bytearray which is the common case for small messages

[codspeed-hq]

CodSpeed Performance Report

Merging #9649 will improve performances by 41.4%

_{Comparing memcpy_websocket_reader (57649f7) with master (541b149)}

Summary

⚡ 2 improvements
✅ 9 untouched benchmarks

Benchmarks breakdown

	Benchmark	master	memcpy_websocket_reader	Change
⚡	test_one_thousand_large_round_trip_websocket_text_messages[pyloop]	32.6 ms	23 ms	+41.4%
⚡	test_read_one_hundred_websocket_text_messages[pyloop]	470.1 µs	351.1 µs	+33.88%

[patchback]

Backport to 3.11: 💚 backport PR created

✅ Backport PR branch: patchback/backports/3.11/f2f5b056e895e11eddd054132a20f83d2d6a7a07/pr-9649

Backported as #9650

🤖 @patchback
I'm built with octomachinery and
my source is open — https://github.com/sanitizers/patchback-github-app.

[bdraco]

[bdraco]

Less time spent parsing now than the receive and DataQueue calls

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.64%. Comparing base (541b149) to head (57649f7).
Report is 1 commits behind head on master.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #9649   +/-   ##
=======================================
  Coverage   98.64%   98.64%           
=======================================
  Files         115      115           
  Lines       35417    35437   +20     
  Branches     4199     4203    +4     
=======================================
+ Hits        34938    34958   +20     
  Misses        321      321           
  Partials      158      158           

Flag	Coverage Δ
CI-GHA	98.53% <100.00%> (+<0.01%)	⬆️
OS-Linux	98.20% <100.00%> (+<0.01%)	⬆️
OS-Windows	96.09% <34.37%> (-0.03%)	⬇️
OS-macOS	97.40% <34.37%> (-0.03%)	⬇️
Py-3.10.11	97.25% <34.37%> (-0.03%)	⬇️
Py-3.10.15	97.68% <100.00%> (+<0.01%)	⬆️
Py-3.11.10	97.75% <100.00%> (-0.01%)	⬇️
Py-3.11.9	97.33% <34.37%> (-0.03%)	⬇️
Py-3.12.7	98.23% <100.00%> (+<0.01%)	⬆️
Py-3.13.0	98.22% <100.00%> (+<0.01%)	⬆️
Py-3.9.13	97.17% <34.37%> (-0.03%)	⬇️
Py-3.9.20	97.59% <100.00%> (+<0.01%)	⬆️
Py-pypy7.3.16	97.21% <100.00%> (+<0.01%)	⬆️
VM-macos	97.40% <34.37%> (-0.03%)	⬇️
VM-ubuntu	98.20% <100.00%> (+<0.01%)	⬆️
VM-windows	96.09% <34.37%> (-0.03%)	⬇️

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