Fixed error in dict equality

[jorgecarleitao]

This also changes the dictionary iterator over values to be of Box<dyn Scalar>, since it is expected to return a single entry. This is consistent with what its slot contains.

Closes #335

[codecov]

Codecov Report

Merging #333 (effecde) into main (a9932a6) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #333   +/-   ##
=======================================
  Coverage   80.95%   80.95%           
=======================================
  Files         325      325           
  Lines       21069    21065    -4     
=======================================
- Hits        17057    17054    -3     
+ Misses       4012     4011    -1     

Impacted Files	Coverage Δ
src/array/dictionary/iterator.rs	50.00% <ø> (ø)
src/array/dictionary/mod.rs	72.50% <100.00%> (ø)
src/array/equal/dictionary.rs	100.00% <100.00%> (ø)
tests/it/array/equal/dictionary.rs	100.00% <100.00%> (ø)
src/io/json/read/reader.rs	74.32% <0.00%> (-1.36%)	⬇️
src/scalar/equal.rs	54.54% <0.00%> (+2.27%)	⬆️
src/io/json_integration/write.rs	6.25% <0.00%> (+6.25%)	⬆️

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