feat(nodejs): upgrade to nodejs v20

[karlprieb]

• upgrades the project to nodejs v20
• migrate test runner from mocha/chai to nodejs native test runner

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 10.81081% with 33 lines in your changes are missing coverage. Please review.

Project coverage is 59.68%. Comparing base (203da04) to head (e37b527). Report is 4 commits behind head on develop.

Files	Patch %	Lines
src/lib/ans-104.ts	0.00%	33 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #104 +/- ## =========================================== + Coverage 59.23% 59.68% +0.44% =========================================== Files 21 21 Lines 5736 5601 -135 Branches 242 243 +1 =========================================== - Hits 3398 3343 -55 + Misses 2336 2257 -79 + Partials 2 1 -1 ```

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