Feat: refactor tests structure organization

[mrLSD]

Description

➡️ Refactored tests structure organization.

• Moved tests/utils.rs to separate module tests/utils.rs - so utils.rs does not run as a test.
• Renamed tests/codec.rs to tests/codec_test.rs

⚠️ Most importantly do not run utility file tests/utils.rs as a test.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (2e702b1) 99.54% compared to head (e1a9229) 99.54%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #26   +/-   ##
=======================================
  Coverage   99.54%   99.54%           
=======================================
  Files           9        9           
  Lines        1975     1975           
=======================================
  Hits         1966     1966           
  Misses          9        9           

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