docs: public void addAddOnInstallationStatusListener(AddOnInstallationStatusListener listener) {
          if (listener == null) {
              throw new IllegalArgumentException("Parameter listener must not be null.");
          }
  
          if (addOnInstallationStatusListeners == null) {
              addOnInstallationStatusListeners = new ArrayList<>();
          }
          addOnInstallationStatusListeners.add(listener);
      }