Simplified code

[jorgecarleitao]

Also added MutableUtf8Array::try_new

[codecov]

Codecov Report

Merging #1088 (bd46079) into main (e3a005d) will decrease coverage by 0.00%.
The diff coverage is 55.00%.

@@            Coverage Diff             @@
##             main    #1088      +/-   ##
==========================================
- Coverage   81.07%   81.07%   -0.01%     
==========================================
  Files         367      367              
  Lines       35315    35305      -10     
==========================================
- Hits        28632    28622      -10     
  Misses       6683     6683              

Impacted Files	Coverage Δ
src/array/specification.rs	91.46% <ø> (-0.31%)	⬇️
src/array/primitive/mod.rs	79.53% <50.00%> (ø)
src/array/utf8/mutable.rs	81.38% <52.17%> (-2.62%)	⬇️
src/array/utf8/mod.rs	81.78% <59.25%> (+2.39%)	⬆️
src/buffer/immutable.rs	79.01% <0.00%> (-4.94%)	⬇️
src/bitmap/utils/slice_iterator.rs	97.56% <0.00%> (-1.22%)	⬇️
src/io/ipc/read/schema.rs	94.56% <0.00%> (+0.31%)	⬆️
src/bitmap/immutable.rs	81.48% <0.00%> (+0.61%)	⬆️
src/io/ipc/read/reader.rs	96.56% <0.00%> (+1.14%)	⬆️

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