Add benchmark for sending large WebSocket messages #7387

Job	Run time
Linter	1m 25s
Generate llhttp sources	6s
Test (3.9, ubuntu, false)	5m 55s
Benchmark	2m 7s
Test (3.9, macos, false)	4m 46s
Test (3.9, windows, false)	6m 53s
Test (3.9, Y, ubuntu, false)	7m 25s
Test (3.10, ubuntu, false)	5m 58s
Test (3.10, macos, false)	6m 48s
Test (3.10, windows, false)	7m 37s
Test (3.10, Y, ubuntu, false)	7m 16s
Test (3.11, ubuntu, false)	6m 38s
Test (3.11, macos, false)	4m 44s
Test (3.11, windows, false)	7m 45s
Test (3.11, Y, ubuntu, false)	8m 37s
Test (3.12, ubuntu, false)	6m 24s
Test (3.12, macos, false)	4m 51s
Test (3.12, windows, false)	7m 28s
Test (3.12, Y, ubuntu, false)	7m 35s
Test (3.13, ubuntu, false)	6m 36s
Test (3.13, macos, false)	5m 16s
Test (3.13, windows, false)	7m 47s
Test (3.13, Y, ubuntu, false)	9m 36s
Test (pypy-3.9, Y, ubuntu, false)	13m 44s
Test (ubuntu, 3.14, true, Y)	3m 10s
check	4s
Pre-Deploy	0s
Build wheels on ${{ matrix.os }} ${{ matrix.qemu }}	0s
Tarball	0s
Deploy	0s
	2h 36m 31s

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