Replaced Display by Debug for Array

[jorgecarleitao]

Currently representing arrays in Debug is a bit verbose. This was useful to iterate over the struct definitions, but as the API stabilizes, we can move to less verbose representations.

This PR goes in this direction by removing the impl Display of the Array and by making the Debug one equal to the current Display one. This allows users to impl Debug on structs that contain arrays and have an easier to read string representation.

This follows the same design used by std::Vec, which does not present the struct details to the users.

This also removes the Display implementation to the datatypes, since it was equal to Debug (and there is no natural Display for them in Arrow).

[jorgecarleitao]

A side product of this is that the assert_eq of two arrays is much easier to read.

[codecov]

Codecov Report

Merging #694 (bd8ae0e) into main (f64339c) will increase coverage by 0.04%.
The diff coverage is 57.14%.

@@            Coverage Diff             @@
##             main     #694      +/-   ##
==========================================
+ Coverage   69.77%   69.82%   +0.04%     
==========================================
  Files         303      303              
  Lines       16855    16905      +50     
==========================================
+ Hits        11761    11804      +43     
- Misses       5094     5101       +7     

Impacted Files	Coverage Δ
src/array/boolean/mod.rs	82.35% <ø> (ø)
src/array/dictionary/mod.rs	64.51% <0.00%> (ø)
src/array/fixed_size_binary/mod.rs	69.62% <ø> (ø)
src/array/fixed_size_list/mod.rs	69.35% <0.00%> (ø)
src/array/null.rs	38.23% <ø> (ø)
src/array/primitive/mutable.rs	84.71% <0.00%> (ø)
src/array/struct_/mod.rs	56.92% <0.00%> (ø)
src/array/union/mod.rs	79.80% <ø> (ø)
src/array/utf8/mod.rs	87.17% <0.00%> (ø)
src/compute/aggregate/min_max.rs	66.66% <ø> (ø)
... and 18 more

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