GraphOptInterface maintenance

[jalving]

This PR does some general maintenance. It mainly adds doc strings and bumps the data structures version. There was an issue with tests and using all_neighbors where the order could be different. I made the function to return a sorted array to keep it consistent.

[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 67.77%. Comparing base (2d72be7) to head (1b89301).
⚠️ Report is 9 commits behind head on main.
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Additional details and impacted files

@@            Coverage Diff             @@
##             main      #14      +/-   ##
==========================================
- Coverage   68.91%   67.77%   -1.15%     
==========================================
  Files           5        5              
  Lines         563      543      -20     
==========================================
- Hits          388      368      -20     
  Misses        175      175              

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