Transformer based segmentation functionality

What's Changed

• Implement UNETR by @constantinpape in #146
• Fixes and Updates for UNETR by @anwai98 in #148
• Minor Fix to UNETR Decoder by @anwai98 in #149
• Add imagecodecs to the dependencies to fix CI by @constantinpape in #150
• Add PanNuke Dataloader by @anwai98 in #153
• Refactor UNETR Training by @anwai98 in #151
• Add Monai's UNETR by @anwai98 in #155
• Add BCSS Dataset by @anwai98 in #156
• Add PanNuke Check Script by @anwai98 in #159
• Updates to MoNuSeg by @anwai98 in #157
• Add Watershed Segmentation Functionality by @anwai98 in #160
• Add MoNuSAC Dataset by @anwai98 in #158
• Raise download prompt - NeurIPS CellSeg by @anwai98 in #161
• Raise warning for Lizard data download by @anwai98 in #163
• Add type annotations - PanNuke by @anwai98 in #165
• Add splits for BCSS dataset by @anwai98 in #164
• UNETR Training with Affinities by @anwai98 in #166
• Save train time in checkpoint by @constantinpape in #169
• Add Raw Transform - nnUNet by @anwai98 in #170
• Bring main up-to-date by @constantinpape in #173
• Add ViT-MAE and Refactor ViT(s) by @anwai98 in #172
• Distance label trafos by @constantinpape in #177
• Fix UNETR Model for LIVECell by @anwai98 in #174
• Add LIVECell Distance Map Experiments by @anwai98 in #175
• Add distance based loss by @constantinpape in #178
• Fix issues in ViT initialization and update UNETR state loading by @constantinpape in #180
• Misc updates to transforms, loss and UNETR by @constantinpape in #181
• Fix UNETR Training - Update Rescaling Inputs by @anwai98 in #179
• Sync dev by @constantinpape in #184
• WIP - Instance Segmentation Experiments by @anwai98 in #187
• Dev by @constantinpape in #188
• Update DeepBacs Loader by @anwai98 in #189
• Implement mitolab benchmark datasets by @constantinpape in #190
• Update UNETR to enable resize to longest side by @constantinpape in #192

Full Changelog: 0.5.2...0.6.0