Add SVE2 instructions to SIMD.

[aserputov]

Enhancement
Hello, @std-simd
I would like to add SVE2 instructions via intrinsics/inline-assembly into std-simd to process data quicker, optimize the library.

[aserputov]

After looking through the code I found that you already have SIMD instructions for x86_64, but you don't have the same functions for ARM/ARM64. I will walk around a bit more to see how to implement the sve/sve2 instructions. I will appreciate any help or advice anybody can provide. From my part, I will add some kind of if&def to switch between different systems.

[aserputov]

I also will add SVE2 to x86 later on.