Fixed small inconsistencies between compute::cast and compute::can_cast

[jorgecarleitao]

The test of the cast consistency check was incorrect, as it was only checking consistency of d1 with d1 instead of all combinations.

Fixing the test also showed some inconsistencies, which this PR fixes.

[codecov]

Codecov Report

Merging #295 (3cd5089) into main (fa3b003) will increase coverage by 2.14%.
The diff coverage is 99.33%.

@@            Coverage Diff             @@
##             main     #295      +/-   ##
==========================================
+ Coverage   77.51%   79.66%   +2.14%     
==========================================
  Files         315      316       +1     
  Lines       20967    20968       +1     
==========================================
+ Hits        16253    16704     +451     
+ Misses       4714     4264     -450     

Impacted Files	Coverage Δ
tests/it/compute/cast.rs	99.31% <99.31%> (ø)
src/compute/cast/mod.rs	89.22% <100.00%> (+42.22%)	⬆️
src/compute/cast/primitive_to.rs	100.00% <0.00%> (+42.04%)	⬆️
src/compute/cast/boolean_to.rs	100.00% <0.00%> (+42.85%)	⬆️
src/compute/cast/utf8_to.rs	92.15% <0.00%> (+64.70%)	⬆️
src/compute/cast/binary_to.rs	100.00% <0.00%> (+100.00%)	⬆️

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