add groups to xarray

[gauteh]

No description provided.

[codecov-commenter]

Codecov Report

Attention: 4 lines in your changes are missing coverage. Please review.

Comparison is base (164178c) 59.16% compared to head (5360518) 59.16%.

Files	Patch %	Lines
src/python/mod.rs	0.00%	4 Missing ⚠️

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Additional details and impacted files

@@           Coverage Diff           @@
##             main      #36   +/-   ##
=======================================
  Coverage   59.16%   59.16%           
=======================================
  Files          22       22           
  Lines        1200     1200           
=======================================
  Hits          710      710           
  Misses        490      490           

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