refactor: add AlignedBitmapSlice

[orlp]

This should simplify writing efficient bitmap loops (assuming there's only a single bitmap, so only a single offset to worry about), I've already applied it in a couple places and recouped the LOC cost of adding it.

[codecov]

Codecov Report

Attention: Patch coverage is 92.25806% with 12 lines in your changes are missing coverage. Please review.

Project coverage is 81.25%. Comparing base (45dff18) to head (25c04eb).
Report is 1 commits behind head on main.

Files	Patch %	Lines
crates/polars-compute/src/filter/boolean.rs	0.00%	8 Missing ⚠️
crates/polars-arrow/src/bitmap/aligned.rs	96.55%	3 Missing ⚠️
crates/polars-arrow/src/bitmap/utils/fmt.rs	80.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #15171      +/-   ##
==========================================
- Coverage   81.25%   81.25%   -0.01%     
==========================================
  Files        1355     1356       +1     
  Lines      175648   175636      -12     
  Branches     2518     2518              
==========================================
- Hits       142730   142718      -12     
  Misses      32436    32436              
  Partials      482      482              

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