chore: Migrate to vitest

[michaeldowseza]

Description of changes:
Migrate to vitest - Faster, more modern, less dependencies, esm support.

Comparing previous runs, this is about 30% faster and reduces the time for npm run test from ~15s to ~9s.

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.16%. Comparing base (57b9bf6) to head (6a0102b).

Additional details and impacted files

@@             Coverage Diff             @@
##              main      #73      +/-   ##
===========================================
- Coverage   100.00%   99.16%   -0.84%     
===========================================
  Files           14       13       -1     
  Lines          443      477      +34     
  Branches       156      167      +11     
===========================================
+ Hits           443      473      +30     
- Misses           0        4       +4     

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[georgylobko]

Looks good to me