Password generator follow policy

Thanks for the proposed solution. I would have like to see it a bit differently:

core.service.yml defines this generator:
  password_generator:
    class: Drupal\Core\Password\DefaultPasswordGenerator

In our module we can just decorate and extend that service so you don't need the ServiceProviderBase.

simple_password_policy.services.yml:

  simple_password_policy.password_generator:
    decorates: password_generator
    class: Drupal\simple_password_policy\SimplePasswordPolicyPasswordGenerator
    arguments: [ '@simple_password_policy.password_generator.inner', '@config.factory']

and

class SimplePasswordPolicyPasswordGenerator extends DefaultPasswordGenerator {
   public function __construct(\Drupal\Core\Password\PasswordGeneratorInterface $original_service, ConfigFactoryInterface $configFactory) {
        $this->originalService = $original_service;
        $this->configFactory = $configFactory;
   }

   ....
}

Also using Drupal::random->string is not secure since it is using mt_rand (see php info https://www.php.net/manual/en/function.mt-rand.php).
So we need another solution preferably using random_int which is considered secure.

Hello @kriboogh, thanks for the review. I have changed the code according to the requirements. Please check it out.

Merged in dev, I rewrote the generate so it validates the generated password using the actual policy against the current user.

Fixed and credited.