DM-48427: Add column groups

[JeremyMcCormick]

Checklist

• Ran Jenkins
• Added a release note for user-visible changes to docs/changes

[codecov]

Codecov Report

Attention: Patch coverage is 98.71795% with 1 line in your changes missing coverage. Please review.

Project coverage is 93.09%. Comparing base (8294325) to head (da3a7f2).
Report is 8 commits behind head on main.

✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
python/felis/datamodel.py	98.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #127      +/-   ##
==========================================
+ Coverage   92.91%   93.09%   +0.17%     
==========================================
  Files          23       23              
  Lines        2895     2967      +72     
  Branches      292      299       +7     
==========================================
+ Hits         2690     2762      +72     
  Misses        118      118              
  Partials       87       87              

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[gpdf]

Approved (there is a small typo that could be fixed, not required). Looking forward to the next steps.