feat: add scalar bitmap index to lance

[raunaks13]

No description provided.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 84.66165% with 102 lines in your changes missing coverage. Please review.

Project coverage is 80.07%. Comparing base (3f26a7b) to head (738cfe8).
Report is 271 commits behind head on main.

Files with missing lines	Patch %	Lines
rust/lance-index/src/scalar/bitmap.rs	70.86%	43 Missing and 31 partials ⚠️
rust/lance-index/src/scalar/lance_format.rs	93.18%	0 Missing and 28 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2560      +/-   ##
==========================================
+ Coverage   80.01%   80.07%   +0.05%     
==========================================
  Files         210      211       +1     
  Lines       60323    60988     +665     
  Branches    60323    60988     +665     
==========================================
+ Hits        48270    48838     +568     
- Misses       9182     9218      +36     
- Partials     2871     2932      +61     

Flag	Coverage Δ
unittests	80.07% <84.66%> (+0.05%)	⬆️

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