Implement AVX512 for integers

Describe the feature you would like to be implemented.

Packet16i for AVX512

Would such a feature be useful for other users? Why?

Any hints on how to implement the requested feature?

I volunteer to implement it

Additional resources

I saw this TODO in AVX512 PacketMath nad I would like to help with it. @cantonios @rmlarsen1 What do you guys think? Thanks.