Moved tests from lib to tests

[jorgecarleitao]

They test public functions, so can be moved

[codecov]

Codecov Report

Merging #1001 (6b91721) into main (aafba7b) will increase coverage by 0.45%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #1001      +/-   ##
==========================================
+ Coverage   71.41%   71.86%   +0.45%     
==========================================
  Files         357      357              
  Lines       19801    20178     +377     
==========================================
+ Hits        14140    14501     +361     
- Misses       5661     5677      +16     

Impacted Files	Coverage Δ
src/bitmap/utils/fmt.rs	95.34% <ø> (ø)
src/types/bit_chunk.rs	100.00% <ø> (ø)
src/ffi/schema.rs	67.53% <0.00%> (-0.63%)	⬇️
src/ffi/array.rs	82.50% <0.00%> (-0.43%)	⬇️
src/ffi/stream.rs	63.21% <0.00%> (+0.29%)	⬆️
src/io/avro/read/deserialize.rs	72.45% <0.00%> (+0.42%)	⬆️
src/compute/arithmetics/time.rs	26.60% <0.00%> (+0.91%)	⬆️
src/bitmap/mutable.rs	91.50% <0.00%> (+1.24%)	⬆️
src/array/primitive/mutable.rs	90.95% <0.00%> (+2.15%)	⬆️
...c/io/parquet/read/deserialize/binary/dictionary.rs	90.90% <0.00%> (+3.03%)	⬆️
... and 1 more

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