Add SVE2 BgrToYuv422pV2 optimization

[ermig1979]

Summary

• Add SVE2 implementation and declaration for BgrToYuv422pV2.
• Dispatch SimdBgrToYuv422pV2 to SVE2 before NEON when available.
• Add SVE2 coverage to BgrToYuv422pV2AutoTest and update release notes.

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$(nproc)
• export LD_LIBRARY_PATH="/workspace/build:$LD_LIBRARY_PATH" && ./Test "-r=.." -fi=BgrToYuv422pV2 -tt=1 -ts=1
• aarch64-linux-gnu-g++ -std=c++17 -O2 -fPIC -I./src -march=armv8.6-a+sve2 -c src/Simd/SimdSve2BgrToYuvV2.cpp -o build/SimdSve2BgrToYuvV2.o
• Emulated ARM64/SVE2 harness comparing Simd::Sve2::BgrToYuv422pV2 with Simd::Base::BgrToYuv422pV2 across multiple widths, heights, and YUV types.