CSV Parser 4.0.0 - Benchmarks, DataFrame gets parallelized, MSVC AV2 Fixes #286

Job	Run time
SIMD branch verification (avx2)	4m 13s
Single-threaded Emscripten build (CSV_ENABLE_THREADS=OFF)	4m 20s
Single-threaded build (CSV_ENABLE_THREADS=OFF)	3m 53s
SIMD branch verification (no-simd)	3m 43s
SIMD branch verification (sse2)	4m 3s
build (ubuntu-latest, Release, gcc, 20)	4m 8s
build (ubuntu-latest, Release, clang, 11)	3m 6s
build (ubuntu-latest, Release, clang, 17)	3m 16s
build (windows-latest, Release, cl, 17)	4m 16s
build (windows-latest, Release, cl, 11)	4m 41s
build (windows-latest, Release, cl, 20)	6m 13s
build (ubuntu-latest, Release, clang, 20)	4m 41s
build (ubuntu-latest, Release, gcc, 17)	3m 15s
build (ubuntu-latest, Release, gcc, 11)	2m 47s
	56m 35s

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