Add deltaE (CIE Lab) metric

[zakajd]

Is your feature request related to a problem? Please describe. deltaE measures distance between images in CIE Lab space.

Describe the solution you'd like Re-write to PyTorch any of those implementations

• https://python-colormath.readthedocs.io/en/latest/delta_e.html
• https://pypi.org/project/deltae/
• https://www.colour-science.org/api/0.3.3/html/_modules/colour/difference/delta_e.html