Improved API of getting mutable from Buffer

[jorgecarleitao]

Aligned it across Bitmap -> MutableBitmap and Offsets -> OffsetsBuffer.

[codecov]

Codecov Report

Base: 83.49% // Head: 83.80% // Increases project coverage by +0.30% 🎉

Coverage data is based on head (6e69ce6) compared to base (7be484e).
Patch coverage: 92.30% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1399      +/-   ##
==========================================
+ Coverage   83.49%   83.80%   +0.30%     
==========================================
  Files         373      373              
  Lines       40758    41710     +952     
==========================================
+ Hits        34029    34953     +924     
- Misses       6729     6757      +28     

Impacted Files	Coverage Δ
src/buffer/immutable.rs	89.65% <87.50%> (-0.59%)	⬇️
src/array/primitive/mod.rs	87.50% <88.88%> (+3.16%)	⬆️
src/array/utf8/mod.rs	86.48% <90.00%> (+1.66%)	⬆️
src/array/binary/mod.rs	95.97% <100.00%> (+3.84%)	⬆️
src/offset.rs	83.59% <100.00%> (-2.03%)	⬇️
src/io/ipc/read/array/boolean.rs	92.45% <0.00%> (-5.67%)	⬇️
src/array/null.rs	51.57% <0.00%> (-0.99%)	⬇️
src/array/dictionary/mod.rs	92.94% <0.00%> (-0.26%)	⬇️
... and 22 more

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