[FEATURE] AVX2 optimised numpy layer

[bml1g12]

Is your feature request related to a problem? Please describe.
I gather AVX2 optimisation will increase speed of numerical libraries like numpy on AWS lambda; would be great to see this as the default layer or an optional choice of layer.

Describe the solution you'd like
https://aws.amazon.com/blogs/compute/creating-faster-aws-lambda-functions-with-avx2/
https://docs.aws.amazon.com/lambda/latest/dg/runtimes-avx2.html