Implement a patch-based active learning algorithm for pathology

[bhashemian]

Depends on

• Pathology HoVerNet: Build the training pipeline #4878
• Pathology HoVerNet: Build the WSI inference pipeline #4883

[yashika-git]

Hi @drbeh,

I've been deeply fascinated by Active Learning and came across this issue as I was looking for open-source implementations of the same for work.
I'd love to help in implementing the same, if possible.
Thanks