Allowed accessing validity without importing Array

[jorgecarleitao]

This avoids importing Array just to access the validity bitmap for structs implementing Array.

[codecov]

Codecov Report

Merging #432 (d454fd2) into main (db92910) will increase coverage by 0.01%.
The diff coverage is 75.00%.

@@            Coverage Diff             @@
##             main     #432      +/-   ##
==========================================
+ Coverage   80.64%   80.66%   +0.01%     
==========================================
  Files         372      372              
  Lines       22691    22709      +18     
==========================================
+ Hits        18300    18318      +18     
  Misses       4391     4391              

Impacted Files	Coverage Δ
src/compute/utils.rs	92.85% <ø> (ø)
src/array/boolean/mod.rs	68.62% <25.00%> (+1.28%)	⬆️
src/array/list/mod.rs	70.45% <65.00%> (+0.68%)	⬆️
src/array/binary/mod.rs	78.37% <100.00%> (+0.60%)	⬆️
src/array/dictionary/mod.rs	46.66% <100.00%> (+1.83%)	⬆️
src/array/fixed_size_binary/mod.rs	46.75% <100.00%> (+1.41%)	⬆️
src/array/fixed_size_list/mod.rs	52.77% <100.00%> (+1.34%)	⬆️
src/array/primitive/mod.rs	79.03% <100.00%> (+0.69%)	⬆️
src/array/struct_.rs	35.48% <100.00%> (+1.41%)	⬆️
src/array/utf8/mod.rs	81.81% <100.00%> (+0.48%)	⬆️
... and 2 more

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