add cargo nextest to CI process

[lucasbalieiro]

to be merged after #39 ;

closes #26 ;

Add cargo next test with the same policies as the ones used in SRI;

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 48.58%. Comparing base (5d5a7de) to head (2592dce).

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Additional details and impacted files

@@           Coverage Diff           @@
##             main      #40   +/-   ##
=======================================
  Coverage   48.58%   48.58%           
=======================================
  Files          18       18           
  Lines        1449     1449           
=======================================
  Hits          704      704           
  Misses        745      745           

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