add inscopix extractor for cell_set

[bendichter]

fix #274

[codecov]

Codecov Report

Attention: Patch coverage is 97.67442% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 79.62%. Comparing base (7aa2a63) to head (e21fe8f).
Report is 21 commits behind head on main.

❗ Current head e21fe8f differs from pull request most recent head 44075b7. Consider uploading reports for the commit 44075b7 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #275      +/-   ##
==========================================
+ Coverage   79.37%   79.62%   +0.25%     
==========================================
  Files          39       41       +2     
  Lines        3069     3112      +43     
==========================================
+ Hits         2436     2478      +42     
- Misses        633      634       +1     

Flag	Coverage Δ
unittests	79.62% <97.67%> (+0.25%)	⬆️

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Files	Coverage Δ
src/roiextractors/extractorlist.py	100.00% <100.00%> (ø)
...tractors/extractors/inscopixextractors/__init__.py	100.00% <100.00%> (ø)
...nscopixextractors/inscopixsegmentationextractor.py	97.56% <97.56%> (ø)