[PR #9649/f2f5b056 backport][3.11] Avoid memory copy in the WebSocket reader for small payloads

[patchback]

This is a backport of PR #9649 as merged into master (f2f5b05).

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 #9650 will improve performances by 36.8%

_{Comparing patchback/backports/3.11/f2f5b056e895e11eddd054132a20f83d2d6a7a07/pr-9649 (f3ed9e2) with 3.11 (4e398d7)}

Summary

⚡ 2 improvements
✅ 9 untouched benchmarks

Benchmarks breakdown

	Benchmark	3.11	patchback/backports/3.11/f2f5b056e895e11eddd054132a20f83d2d6a7a07/pr-9649	Change
⚡	test_one_thousand_large_round_trip_websocket_text_messages[pyloop]	32.9 ms	24 ms	+36.8%
⚡	test_read_one_hundred_websocket_text_messages[pyloop]	490.7 µs	370.8 µs	+32.32%

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.89%. Comparing base (4e398d7) to head (f3ed9e2).
Report is 1 commits behind head on 3.11.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             3.11    #9650   +/-   ##
=======================================
  Coverage   97.89%   97.89%           
=======================================
  Files         116      116           
  Lines       35492    35512   +20     
  Branches     4252     4256    +4     
=======================================
+ Hits        34744    34764   +20     
  Misses        559      559           
  Partials      189      189           

Flag	Coverage Δ
CI-GHA	97.77% <100.00%> (+<0.01%)	⬆️
OS-Linux	97.47% <100.00%> (+<0.01%)	⬆️
OS-Windows	94.37% <34.37%> (-0.03%)	⬇️
OS-macOS	96.67% <34.37%> (-0.03%)	⬇️
Py-3.10.11	96.53% <34.37%> (-0.03%)	⬇️
Py-3.10.15	96.96% <100.00%> (+<0.01%)	⬆️
Py-3.11.10	97.04% <100.00%> (+<0.01%)	⬆️
Py-3.11.9	96.62% <34.37%> (-0.03%)	⬇️
Py-3.12.7	97.51% <100.00%> (+<0.01%)	⬆️
Py-3.13.0	97.49% <100.00%> (+<0.01%)	⬆️
Py-3.9.13	96.46% <34.37%> (-0.03%)	⬇️
Py-3.9.20	96.88% <100.00%> (+<0.01%)	⬆️
Py-pypy7.3.16	96.49% <100.00%> (+<0.01%)	⬆️
VM-macos	96.67% <34.37%> (-0.03%)	⬇️
VM-ubuntu	97.47% <100.00%> (+<0.01%)	⬆️
VM-windows	94.37% <34.37%> (-0.03%)	⬇️

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