feat: make IVF_HNSW_SQ work with dot distance

[eddyxu]

• Make SQ storage work with Dot distance
• Add test for IVF_HNSW_SQ + Dot

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 71.42857% with 8 lines in your changes missing coverage. Please review.

Project coverage is 80.02%. Comparing base (bf6b104) to head (9b1987e).
Report is 2 commits behind head on main.

Files	Patch %	Lines
rust/lance-index/src/vector/sq/storage.rs	27.27%	8 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2472      +/-   ##
==========================================
+ Coverage   80.01%   80.02%   +0.01%     
==========================================
  Files         207      207              
  Lines       58735    58753      +18     
  Branches    58735    58753      +18     
==========================================
+ Hits        46997    47020      +23     
- Misses       8984     8985       +1     
+ Partials     2754     2748       -6     

Flag	Coverage Δ
unittests	80.02% <71.42%> (+0.01%)	⬆️

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