Allow marking a directory to pass the isModule check

[vire]

Feature request description

When using depcheck inside a NX monorepo - it might happen certain folders contain temproray package.json which can have omitted dependencies (that will be populated during build of such packages) - but now these directories are skipped by depcheck

I'd welcome an config option either to explicitly allow depchecking or some better advice.

Code snippets (if applicable)

How the dependency is used (if applicable):

function isModule(dir) {
  try {
    if(config.isModuleSelectedForDepcheck(path.resolve(dir)) ) {
      return false
    }
    readJSON(path.resolve(dir, 'package.json'));
    return true;
  } catch (error) {
    return false;
  }
}

[vire]

duplicate #704