feat: x86 simd implementation for i8x16_swizzle + i8x16_shuffle #457

Job	Run time
Build wasm	2m 43s
Run tests on Linux x86 (stable)	46s
Run tests on Linux arm64	2m 32s
Run tests on Linux x86 (nightly, no default features)	52s
Run tests on Linux x86 (nightly)	52s
Run tests on macOS arm64 (Apple M1)	1m 8s
Run tests on Linux armv7	2m 18s
Run tests on Linux x86 (stable, no default features)	56s
	12m 7s

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