Retreive within_group from mdata OR adata

[grst]

Closes #457

• CHANGELOG.md updated
• Tests added (For bug fixes or new features)

[codecov]

Codecov Report

Attention: 3 lines in your changes are missing coverage. Please review.

Comparison is base (ad45749) 81.19% compared to head (79d7cd1) 81.17%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #459      +/-   ##
==========================================
- Coverage   81.19%   81.17%   -0.02%     
==========================================
  Files          49       49              
  Lines        3866     3868       +2     
==========================================
+ Hits         3139     3140       +1     
- Misses        727      728       +1     

Files	Coverage Δ
src/scirpy/ir_dist/_clonotype_neighbors.py	99.29% <ø> (ø)
src/scirpy/tl/_ir_query.py	93.61% <ø> (ø)
src/scirpy/tl/_clonotypes.py	87.26% <75.00%> (-0.49%)	⬇️

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