Simplified tests

[jorgecarleitao]

This moves the integration tests to tests/it, following the practice outlined here

[codecov-commenter]

Codecov Report

Merging #104 (6386cc1) into main (a6e6cf3) will decrease coverage by 6.33%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #104      +/-   ##
==========================================
- Coverage   68.09%   61.75%   -6.34%     
==========================================
  Files          72       66       -6     
  Lines        3911     2782    -1129     
==========================================
- Hits         2663     1718     -945     
+ Misses       1248     1064     -184     

Impacted Files	Coverage Δ
src/encoding/delta_length_byte_array/encoder.rs	77.77% <0.00%> (-22.23%)	⬇️
src/write/mod.rs	75.00% <0.00%> (-17.41%)	⬇️
src/schema/io_message/from_message.rs	66.87% <0.00%> (-14.56%)	⬇️
src/read/mod.rs	83.87% <0.00%> (-9.60%)	⬇️
src/compression.rs	82.22% <0.00%> (-6.02%)	⬇️
src/write/page.rs	47.22% <0.00%> (-2.78%)	⬇️
src/encoding/uleb128.rs	95.45% <0.00%> (-2.66%)	⬇️
src/encoding/bitpacking.rs	95.91% <0.00%> (-2.16%)	⬇️
src/encoding/delta_bitpacked/decoder.rs	93.18% <0.00%> (-1.61%)	⬇️
src/schema/io_thrift/to_thrift.rs	97.14% <0.00%> (-0.42%)	⬇️
... and 59 more

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