[Improvement] TYPO3 12: Use php Enum for event type and status

[3l73]

The status for the events inside the queue are currently coded at multiple places.

Since PHP 8 it is possible to use enums, which is a easy way to define these status

enum EventState {
    case New;
    case Pending;
    case Claimed;
    case Failed;
    case Deferred;
    case All;
    
    public function toLower(): string
    {
        return strtolower($this->name);
    }
}

The value of the enum could be accessed via name and be used as values for the database:

  protected function queueEvent(Module $module, array $result): Event
  {
    $event = $this->eventRepository->findOneByModuleAndEventId($module, (int)$result['id']);
    $new = false;
    if (!$event) {
      $event = new Event();
      $new = true;
    } elseif ($event->getStatus() === EventState::Claimed->toLower()) {
      return $event;
    }

    $event->setModule($module);
    $event->setCrdate(strtotime($result['mod_time']));
    $event->setEventId($result['id']);
    $event->setObjectId($result['object_id']);
    $event->setEventType(Event::resolveEventType($result['event_type']));
    $event->setStatus(EventState::Pending->toLower());

Since the enum can be used as argument for methods, this can be used instead of constants.

Example:

printName(EventState::Claimed);

function printName(EventState $state) {
 print $state->name . PHP_EOL;
}