[minmax] Expose minmax heterogeneous distance api

[arkrishn94]

I missed exposing the public api for minmax distance functions from #798.

Bumped version to 0.49.1

[Copilot]

Pull request overview

This PR exposes heterogeneous MinMax distance support by generalizing MinMax distance trait impls (and related multi-vector distances) from a single bitrate const generic to separate (N, M) bitrates, enabling e.g. MinMax<8> queries against MinMax<4/2/1> documents as introduced in #798.

Changes:

• Generalize MinMaxIP, MinMaxL2Squared, MinMaxCosine, and MinMaxCosineNormalized to accept different bitrates for left/right operands.
• Update MinMax multi-vector MaxSim/Chamfer implementations and tests to cover heterogeneous (8,4), (8,2), (8,1) cases.
• Adjust heterogeneous InnerProduct test labels to pass lazy_format!(...) by value.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
diskann-quantization/src/minmax/vectors.rs	Makes MinMax single-vector distance impls heterogeneous via (N, M) const generics.
diskann-quantization/src/minmax/multi/max_sim.rs	Extends MinMax multi-vector distances to heterogeneous bitrates and adds tests for them.
diskann-quantization/src/bits/distances.rs	Minor test harness update to pass lazy_format! without borrowing.

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[codecov-commenter]

Codecov Report

❌ Patch coverage is 94.00000% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 89.10%. Comparing base (85e5e48) to head (a5ddc51).
⚠️ Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
diskann-quantization/src/minmax/multi/max_sim.rs	88.46%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #833      +/-   ##
==========================================
- Coverage   89.11%   89.10%   -0.01%     
==========================================
  Files         443      443              
  Lines       83354    83359       +5     
==========================================
+ Hits        74278    74280       +2     
- Misses       9076     9079       +3     

Flag	Coverage Δ
miri	89.10% <94.00%> (-0.01%)	⬇️
unittests	88.94% <94.00%> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
diskann-quantization/src/bits/distances.rs	98.93% <100.00%> (ø)
diskann-quantization/src/minmax/vectors.rs	94.77% <100.00%> (+0.03%)	⬆️
diskann-quantization/src/minmax/multi/max_sim.rs	98.10% <88.46%> (+0.03%)	⬆️

... and 6 files with indirect coverage changes

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