test: Use node.js test runner

[avaly]

Warning

This PR is not 100% ready

I was interested to see how far we can get with replacing jest with the new native test runner in Node.js v20.

AFAICT The main blocker now is the fact that we can't mock ESM imports.

import * as model from '../model';
// ...

test('initialize with no models registered', (t) => {
  t.mock.method(model, 'build');

  const papr = new Papr();

  papr.initialize(db); // `model.build` inside the app code will not be mocked

  equal(model.build.mock.callCount(), 0);
});

Any tips on how to proceed would be appreciated.