feat: Make it optional to provide splits for Sampler in LoadRequest

[felix0097]

This PR makes it optional to provide splits in the annbatch.types.LoadRequest.

The logic is the following:

• If splits is provided -> use splits
• If splits is not provided -> do random batching

[codecov]

Codecov Report

❌ Patch coverage is 92.85714% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 91.06%. Comparing base (8f6c156) to head (d8f862c).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/annbatch/samplers/_chunk_sampler.py	66.66%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #127      +/-   ##
==========================================
- Coverage   93.76%   91.06%   -2.70%     
==========================================
  Files          10       10              
  Lines         770      795      +25     
==========================================
+ Hits          722      724       +2     
- Misses         48       71      +23     

Files with missing lines	Coverage Δ
src/annbatch/abc/sampler.py	100.00% <100.00%> (ø)
src/annbatch/types.py	100.00% <100.00%> (ø)
src/annbatch/samplers/_chunk_sampler.py	93.33% <66.66%> (-1.91%)	⬇️

... and 3 files with indirect coverage changes

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[ilan-gold]

Big question is how to handle shuffle - user problem or ours?

[ilan-gold]

I would mention that we are interpreting this as shuffling in-memory, but it is up to the implementer to shuffle from the on-disk

[ilan-gold]

Also the bit about batch_size

[ilan-gold]

@felix0097 Can you add a changelog entry?