Function xyzToOKLab

Converts a color from CIE XYZ to OKLab color space.

This function implements the XYZ to OKLab conversion algorithm, which includes:

1. Converting XYZ to LMS cone responses using a transformation matrix
2. Applying a non-linear transformation (cube root) to the LMS values
3. Converting the non-linear LMS values to OKLab using another matrix

The OKLab color space is designed to be perceptually uniform with improved accuracy compared to the traditional Lab space.