Move tests from src/compute/ to tests/

[VasanthakumarV]

Closes #409

Unit tests from the following files were not moved, because they referenced private functions,

./src/compute/comparison/primitive.rs
./src/compute/comparison/binary.rs
./src/compute/comparison/utf8.rs
./src/compute/comparison/boolean.rs
./src/compute/arithmetics/decimal/mod.rs
./src/compute/take/utf8.rs
./src/compute/take/boolean.rs
./src/compute/take/list.rs
./src/compute/sort/primitive/sort.rs
./src/compute/sort/primitive/indices.rs

[codecov]

Codecov Report

Merging #423 (1aa902f) into main (aee8124) will increase coverage by 0.01%.
The diff coverage is 99.66%.

@@            Coverage Diff             @@
##             main     #423      +/-   ##
==========================================
+ Coverage   80.78%   80.80%   +0.01%     
==========================================
  Files         353      372      +19     
  Lines       22600    22648      +48     
==========================================
+ Hits        18257    18300      +43     
- Misses       4343     4348       +5     

Impacted Files	Coverage Δ
src/compute/aggregate/memory.rs	25.00% <ø> (-15.00%)	⬇️
src/compute/aggregate/min_max.rs	66.66% <ø> (-12.48%)	⬇️
src/compute/aggregate/sum.rs	66.66% <ø> (-10.72%)	⬇️
src/compute/arithmetics/basic/add.rs	85.18% <ø> (-9.66%)	⬇️
src/compute/arithmetics/basic/div.rs	92.30% <ø> (-4.22%)	⬇️
src/compute/arithmetics/basic/mul.rs	85.18% <ø> (-9.66%)	⬇️
src/compute/arithmetics/basic/pow.rs	100.00% <ø> (ø)
src/compute/arithmetics/basic/rem.rs	92.30% <ø> (-4.22%)	⬇️
src/compute/arithmetics/basic/sub.rs	85.18% <ø> (-9.66%)	⬇️
src/compute/arithmetics/decimal/add.rs	80.82% <ø> (-10.46%)	⬇️
... and 52 more

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[VasanthakumarV]

Not sure why the docs pipeline failed, locally I am able to run cargo doc --lib --features full --no-deps (1.57.0-nightly),
I saw an issue for something similar opened today, but I also see that other pipelines here have run successfully.

[jorgecarleitao]

Thank you so much!