Added more tests for utf8

[jorgecarleitao]

Covering #542 well to ensure all is good.

[codecov]

Codecov Report

Merging #543 (dc54d5f) into main (bd8f02b) will decrease coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #543      +/-   ##
==========================================
- Coverage   81.25%   81.24%   -0.02%     
==========================================
  Files         380      380              
  Lines       23376    23458      +82     
==========================================
+ Hits        18995    19059      +64     
- Misses       4381     4399      +18     

Impacted Files	Coverage Δ
tests/it/array/utf8/mod.rs	100.00% <100.00%> (+2.35%)	⬆️
src/io/ipc/write/common.rs	76.28% <0.00%> (+0.64%)	⬆️
src/io/parquet/write/mod.rs	66.78% <0.00%> (+1.14%)	⬆️
src/io/avro/read/schema.rs	55.95% <0.00%> (+1.19%)	⬆️
src/compute/arithmetics/time.rs	46.93% <0.00%> (+2.04%)	⬆️

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