Commit to file for reproducibility

[constantinpape]

Add an option to save all the prompts for interactive segmentation.

This would save the prompts per segmented object in an extra directory to enable reproducing the segmentation.
The easiest way to implement this would be adding this to the commit button, and then save the prompts per object to a folder.

See initial discussion in #406

[constantinpape]

After thinking about this: the best idea is just to mirror ALL relevant layers (prompts and committed objects) in a zarr file, along the idea in #434 (comment).
I will implement this now.
cc @anwai98

[constantinpape]

The core logic is implemented in #451. What's still missing:

• Document the file format.
• Save high level information in the zarr file, cf. Add micro-sam version signature to files #445
• Also save relevant options from widgets, e.g. save the settings of the segment_object or auto segmentation widgets.
• Reload prompts and reproduce segmentation from them (this is more work and I will likely only have time after NM submission)

[constantinpape]

The important metadata (model_type, model hash, micro_sam version) are now saved in the file since #507.
Still missing:

• Documentation
• Saving options for the widgets
• Tests (the logic is quite complex now, so we should write tests for it)
• Recreating the segmentation from the prompts

[constantinpape]

I have implemented more of this in #959 . What's missing is to recreate segmentation from the saved prompts, validating that this matches the committed_objects, adding a function / CLI to continue annotation from a commit path, and some doc on it.

[constantinpape]

Draft PR to finalize this: #976