Add use of PHP 8 features

A new branch "3481620-add-use-of" has been opened with fixes for PHP 8 features, but I don't think it's finished yet. Need to spend time on additional fixes and testing.

Thanks for your work so far! I see that you removed properties from AbandonedCartMail and AbandonedCarts. Was that intentional?

I see that you removed properties from AbandonedCartMail and AbandonedCarts. Was that intentional?

Ah, I see now that the properties are not removed, but are defined in the constructor instead:

  public function __construct(
    protected Connection $connection,
    ConfigFactoryInterface $config_factory,
    QueueFactory $queue_factory,
    protected ModuleHandlerInterface $moduleHandler,
    protected TimeInterface $time,
    protected LoggerInterface $logger
  )

I'm not used to this pattern yet, but I agree it is the modern way forward.

@megachriz

Yeah, this is "Constructor property promotion". Since this module is not that big, it makes sense to refactor everything possible to support all PHP 8 features.