Add sigmoid_kernel Function

[icfaust]

The sigmoid kernel converts data via tanh into a new space. This is easy difficulty, but requires significant benchmarking to find when the scikit-learn-intelex implementation provides better performance. This project will focus on the public API and including the benchmarking results for a seamless, high-performance user experience. Combines with the other kernel projects to a medium time commitment.

Scikit-learn definition can be found at: https://scikit-learn.org/stable/modules/generated/sklearn.metrics.pairwise.sigmoid_kernel.html

The onedal interface can be found at: https://github.com/uxlfoundation/scikit-learn-intelex/blob/main/onedal/primitives/kernel_functions.py#L127