fix: migrate from tap to node test and c8

[nimesh0505]

Checklist

This PR replaces tap with node:test for testing and adds c8 for coverage.

• run npm run test and npm run benchmark
• tests and/or benchmarks are included
• commit message and code follows the Developer's Certification of Origin
  and the Code of conduct

[gurgunday]

If the taprc file did not contain disable-coverage: true, please enable c8 coverage; for how, see my suggested change

[jsumners]

Why have all of the test function been refactored to async functions?

[nimesh0505]

@jsumners Thank you for your question. You are right to notice that all test functions have been converted to async functions. While it's not strictly necessary for the migration from tap to node:test, I chose to do so due to these reasons:

1. Consistency - It provides a uniform pattern across all tests.
2. Future-proofing - It allows for easier integration of async operations in the future if needed.
3. Minimal impact: The change doesn't negatively affect the tests' functionality or performance.

However, if the team prefers to keep the tests as close to the original implementation as possible, we can certainly revert this change and only use async functions where necessary.

[jsumners]

Unless there is a need for the functions to be async, please do not make them so.

[gurgunday]

lgtm

no strong opinions about #248 (comment)

[Uzlopak]

I agree with @jsumners . It doesnt make any sesnse and has no benefit of making functions async if there is nothing to be awaited etc.. So yes, please remove unnecesasry async.

#248 (comment)

[simoneb]

comments addressed

[mcollina]

lgtm