Split confulent lesions scil_labels_from_mask

[zinelya]

Quick description

This PR introduces a new optional parameter --min_distance to the scil_labels_from_mask script. This feature allows the user to split "confluent" lesions—multiple lesions that have merged into a single connected component—using the Watershed algorithm.

Type of change

Check the relevant options.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Provide data, screenshots, command line to test (if relevant)

mask.nii.gz
default_labels.nii.gz
min_dist_labels.nii.gz

Checklist

• My code follows the style guidelines of this project (run autopep8)
• I added relevant citations to scripts, modules and functions docstrings and descriptions
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I moved all functions from the script file (except the argparser and main) to scilpy modules
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

[codecov]

Codecov Report

❌ Patch coverage is 38.46154% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 72.70%. Comparing base (fc390bf) to head (e26e123).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1308      +/-   ##
==========================================
- Coverage   72.72%   72.70%   -0.02%     
==========================================
  Files         295      295              
  Lines       25445    25457      +12     
  Branches     3565     3566       +1     
==========================================
+ Hits        18505    18509       +4     
- Misses       5437     5443       +6     
- Partials     1503     1505       +2     

Flag	Coverage Δ
smoketests	69.70% <38.46%> (-0.02%)	⬇️
unittests	13.83% <23.07%> (+<0.01%)	⬆️

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Components	Coverage Δ
Scripts	75.39% <100.00%> (+<0.01%)	⬆️
Library	69.50% <27.27%> (-0.05%)	⬇️

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