Add some examples of segmentation evaluation metrics such as PQ and AJI

[peng-1998]

🚀 Feature

Add some examples of segmentation evaluation metrics such as PQ and AJI

Motivation

I'm doing my own research on instance segmentation of cell nuclei, and I didn't find any evaluation metrics for instance segmentation in kornia's documentation. I would like to recommend my implementation of instance segmentation evaluation metrics to kornia in the hope that it can help more researchers. My project：https://github.com/peng-1998/vary_fast_instance_segmentation_metrics