feat: GroupedCollection to support a within-group shuffled and indexed format

[selmanozleyen]

todo

[codecov]

Codecov Report

❌ Patch coverage is 92.72727% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 91.34%. Comparing base (dd6e16c) to head (5cbc7b4).

Files with missing lines	Patch %	Lines
src/annbatch/io.py	92.66%	8 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #146      +/-   ##
==========================================
- Coverage   93.36%   91.34%   -2.03%     
==========================================
  Files          10       10              
  Lines         829      901      +72     
==========================================
+ Hits          774      823      +49     
- Misses         55       78      +23     

Files with missing lines	Coverage Δ
src/annbatch/__init__.py	100.00% <100.00%> (ø)
src/annbatch/loader.py	89.26% <ø> (-3.36%)	⬇️
src/annbatch/io.py	93.08% <92.66%> (-0.01%)	⬇️

... and 2 files with indirect coverage changes

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