Add CIE's 1976 LUV color space support

[castarco]

It would be interesting to add support to add support to the CIE's 1976 LUV color space (derived from the CIE's 1960 MacAdam color space).

Related work:

• Creating CIELUV class in Litipk.ColorSharp.ColorSpaces namespace.
• Adding tests to cover the CIELUV class.

Wikipedia article about this color space: https://en.wikipedia.org/wiki/CIELUV