Fixed error in slicing bitmap.

[jorgecarleitao]

When the slice has an offset and crosses a byte, we need to also take that byte into account.

Thanks to @ritchie46 for initially reporting it. 👍

[codecov]

Codecov Report

Merging #250 (41fb510) into main (fa3c2ce) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #250   +/-   ##
=======================================
  Coverage   76.81%   76.81%           
=======================================
  Files         229      229           
  Lines       19617    19628   +11     
=======================================
+ Hits        15068    15078   +10     
- Misses       4549     4550    +1     

Impacted Files	Coverage Δ
src/bitmap/immutable.rs	87.34% <100.00%> (+1.04%)	⬆️
src/bitmap/utils/slice_iterator.rs	96.57% <100.00%> (+0.14%)	⬆️
src/io/csv/write/mod.rs	87.50% <0.00%> (-2.78%)	⬇️
src/io/parquet/read/binary/nested.rs	86.41% <0.00%> (-1.39%)	⬇️
src/compute/cast/timestamps.rs	93.58% <0.00%> (-1.29%)	⬇️
src/compute/arithmetics/mod.rs	51.12% <0.00%> (-0.76%)	⬇️
src/compute/merge_sort/mod.rs	93.70% <0.00%> (-0.40%)	⬇️
src/io/parquet/write/mod.rs	69.57% <0.00%> (-0.33%)	⬇️
src/compute/comparison/mod.rs	90.72% <0.00%> (+0.09%)	⬆️
src/io/json/schema.rs	42.12% <0.00%> (+0.28%)	⬆️
... and 3 more

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