chore: expose find_partition method

[chebbyChefNEQ]

expose internal method

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 87.50000% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 81.03%. Comparing base (57ec5b3) to head (71b8b24).

Files	Patch %	Lines
rust/lance/src/index/vector/ivf.rs	87.50%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2106      +/-   ##
==========================================
- Coverage   81.03%   81.03%   -0.01%     
==========================================
  Files         160      160              
  Lines       47277    47282       +5     
  Branches    47277    47282       +5     
==========================================
+ Hits        38311    38313       +2     
  Misses       6771     6771              
- Partials     2195     2198       +3     

Flag	Coverage Δ
unittests	81.03% <87.50%> (-0.01%)	⬇️

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