Fixed error in computing slices of set bitmaps.

[jorgecarleitao]

The slice iterator could go beyond bounds, which would trigger a panic e.g. in filter. This PR fixes this.

Closes #292

[codecov]

Codecov Report

Merging #293 (3d90436) into main (0742edd) will increase coverage by 0.01%.
The diff coverage is 98.95%.

@@            Coverage Diff             @@
##             main     #293      +/-   ##
==========================================
+ Coverage   77.25%   77.26%   +0.01%     
==========================================
  Files         315      315              
  Lines       20791    20805      +14     
==========================================
+ Hits        16062    16075      +13     
- Misses       4729     4730       +1     

Impacted Files	Coverage Δ
tests/it/bitmap/utils/slice_iterator.rs	98.90% <98.90%> (-1.10%)	⬇️
src/bitmap/immutable.rs	84.61% <100.00%> (+0.24%)	⬆️
src/bitmap/utils/slice_iterator.rs	94.02% <100.00%> (+1.49%)	⬆️
src/io/json/read/reader.rs	74.32% <0.00%> (-1.36%)	⬇️

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