Add SVE2 BgraToBgr optimization

[ermig1979]

Summary

• Add SVE2 implementation of BgraToBgr and dispatch it from SimdBgraToBgr.
• Extend BgraToBgrAutoTest to cover the SVE2 implementation.
• Add the new source file to the VS2022 SVE2 project and document the release note.

Testing

• cmake ./prj/cmake -B build -DCMAKE_BUILD_TYPE=Release -DCMAKE_CXX_COMPILER=g++ -DCMAKE_C_COMPILER=gcc -DSIMD_TOOLCHAIN="g++" -DSIMD_TARGET="" -DSIMD_AVX512VNNI=ON -DSIMD_AMXBF16=ON -DSIMD_TEST_FLAGS="-march=native" -DSIMD_SHARED=ON
• cmake --build build --parallel$(nproc)
• export LD_LIBRARY_PATH="$(pwd)/build:$LD_LIBRARY_PATH" && ./build/Test "-r=." -fi=BgraToBgr -tt=1 -ts=1
• aarch64-linux-gnu-g++ -std=c++17 -O2 -march=armv8-a+sve2 -I src -c src/Simd/SimdSve2BgraToBgr.cpp -o /tmp/SimdSve2BgraToBgr.o
• qemu-aarch64 -cpu max ./build/sve2_bgra_to_bgr_smoke
• qemu-aarch64 -cpu max,sve-max-vq=1 ./build/sve2_bgra_to_bgr_smoke && qemu-aarch64 -cpu max,sve-max-vq=4 ./build/sve2_bgra_to_bgr_smoke