Moved tests to integration tests

[jorgecarleitao]

This makes it easier to spot and test changes in the API.

See https://matklad.github.io/2021/02/27/delete-cargo-integration-tests.html for details.

[codecov]

Codecov Report

Merging #288 (3fa3d8f) into main (959d549) will increase coverage by 0.03%.
The diff coverage is 99.36%.

@@            Coverage Diff             @@
##             main     #288      +/-   ##
==========================================
+ Coverage   77.55%   77.59%   +0.03%     
==========================================
  Files         260      280      +20     
  Lines       21048    21071      +23     
==========================================
+ Hits        16324    16349      +25     
+ Misses       4724     4722       -2     

Impacted Files	Coverage Δ
src/bitmap/utils/chunk_iterator/chunks_exact.rs	71.87% <ø> (-7.68%)	⬇️
src/bitmap/utils/chunk_iterator/mod.rs	85.91% <ø> (-7.19%)	⬇️
src/bitmap/utils/iterator.rs	100.00% <ø> (ø)
src/bitmap/utils/mod.rs	100.00% <ø> (ø)
src/bitmap/utils/zip_validity.rs	96.00% <ø> (-2.84%)	⬇️
src/buffer/immutable.rs	94.87% <ø> (-2.63%)	⬇️
src/buffer/mutable.rs	88.42% <ø> (-3.53%)	⬇️
src/ffi/array.rs	43.24% <ø> (-35.97%)	⬇️
src/io/ipc/read/reader.rs	83.62% <ø> (-4.20%)	⬇️
src/io/ipc/read/stream.rs	82.27% <ø> (-4.26%)	⬇️
... and 68 more

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