Add MPMC comparison benchmark

[caomengxuan666]

Summary

• add moodycamel::ConcurrentQueue v1.0.5 as an MPMC reference queue
• add a Google Benchmark target that compares uniform single enqueue, uneven wave, and bulk enqueue MPSC workloads
• document the Clang Release benchmark results in both English and Chinese READMEs

Validation

• cmake -S . -B out/build/clang-local -G Ninja -DCMAKE_CXX_COMPILER=clang++ -DCMAKE_BUILD_TYPE=Release
• cmake --build out/build/clang-local --target mpsc_vs_mpmc_benchmark
• cmake --build out/build/clang-local --target mpsc_tests
• ctest --test-dir out/build/clang-local -R MPSC --output-on-failure
• .\out\build\clang-local\mpsc_vs_mpmc_benchmark.exe --benchmark_min_time=0.1s --benchmark_repetitions=1 --benchmark_counters_tabular=true

[dakingffo]

An automated comparsion benchmark test is indeed better.

[dakingffo]

Great simplification！