Added len to every array

[jorgecarleitao]

This allows using the arrays without importing the Array trait.

[codecov]

Codecov Report

Merging #599 (3ef3e52) into main (3caa204) will increase coverage by 0.03%.
The diff coverage is 71.18%.

@@            Coverage Diff             @@
##             main     #599      +/-   ##
==========================================
+ Coverage   79.19%   79.22%   +0.03%     
==========================================
  Files         400      400              
  Lines       24885    25012     +127     
==========================================
+ Hits        19708    19817     +109     
- Misses       5177     5195      +18     

Impacted Files	Coverage Δ
src/array/binary/iterator.rs	87.50% <ø> (ø)
src/array/dictionary/iterator.rs	50.00% <ø> (ø)
src/array/equal/boolean.rs	100.00% <ø> (ø)
src/array/union/iterator.rs	85.71% <ø> (ø)
src/array/utf8/iterator.rs	68.18% <ø> (ø)
src/compute/arity.rs	77.63% <ø> (ø)
src/compute/boolean_kleene.rs	71.42% <ø> (ø)
src/compute/sort/binary.rs	75.00% <ø> (ø)
src/compute/sort/boolean.rs	89.47% <ø> (ø)
src/compute/sort/primitive/indices.rs	94.82% <ø> (ø)
... and 16 more

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