Simplified code of json schema inference

[jorgecarleitao]

The inference depended on the Ord of DataType, which is not ideal because DataType are not ordered.

[codecov]

Codecov Report

Merging #339 (99cd438) into main (f79ae3e) will decrease coverage by 0.00%.
The diff coverage is 90.62%.

@@            Coverage Diff             @@
##             main     #339      +/-   ##
==========================================
- Coverage   80.97%   80.97%   -0.01%     
==========================================
  Files         326      326              
  Lines       21167    21189      +22     
==========================================
+ Hits        17141    17158      +17     
- Misses       4026     4031       +5     

Impacted Files	Coverage Δ
src/io/json/read/infer_schema.rs	90.83% <90.62%> (+2.16%)	⬆️
tests/it/io/csv/read.rs	100.00% <0.00%> (ø)
src/array/equal/mod.rs	91.26% <0.00%> (+1.58%)	⬆️
src/io/csv/read/deserialize.rs	60.28% <0.00%> (+4.03%)	⬆️
src/io/json_integration/write.rs	6.25% <0.00%> (+6.25%)	⬆️

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