Add SVE2 optimization for descriptor Decode32f

[ermig1979]

Summary

• Add SVE2 DescrIntDecode32f dispatch and implementation for depths 4 through 8.
• Extend descriptor decode autotests to include SVE2.
• Register the new SVE2 decode source in Visual Studio project files 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=DescrIntDecode32f -tt=1 -ts=1
• aarch64-linux-gnu-g++ -std=c++17 -O2 -I./src -march=armv9-a+sve2 -msve-vector-bits=scalable -c src/Simd/SimdSve2DescrIntDec.cpp -o /tmp/SimdSve2DescrIntDec.o
• aarch64-linux-gnu-g++ -std=c++17 -O2 -I./src -march=armv9-a+sve2 -msve-vector-bits=scalable -c src/Simd/SimdSve2DescrInt.cpp -o /tmp/SimdSve2DescrInt.o
• python3 packed-depth extraction formula check for depths 4 through 7.