Issue #3303441 by tame4tex: Move to a Plugin architecture

<?php

namespace Drupal\views_migration\Annotation;

/**

 * Defines a Migrate Views Access plugin annotation object.

 *

 * Plugin Namespace: Plugin\migrate\views\access

 *

 * @ingroup views_migration

 *

 * @Annotation

 */

class MigrateViewsAccess extends MigrateViewsAnnotationBase {

}

<?php

namespace Drupal\views_migration\Annotation;

use Drupal\Component\Annotation\Plugin;

/**

 * Defines an abstract base class for all Migrate Views plugin annotations.

 */

abstract class MigrateViewsAnnotationBase extends Plugin {

  /**

   * The plugin ID.

   *

   * @var string

   */

  public $id;

  /**

   * The Drupal core version(s) this plugin applies to.

   *

   * @var int[]

   */

  public $core;

  /**

   * The Views Plugin IDs the plugin is responsible for.

   *

   * @var string[]

   */

  public $plugin_ids = [];

}

<?php

namespace Drupal\views_migration\Annotation;

/**

 * Defines a Migrate Views Area plugin annotation object.

 *

 * Plugin Namespace: Plugin\migrate\views\area

 *

 * @ingroup views_migration

 *

 * @Annotation

 */

class MigrateViewsArea extends MigrateViewsHandlerAnnotationBase {

}

<?php

namespace Drupal\views_migration\Annotation;

/**

 * Defines a Migrate Views Argument plugin annotation object.

 *

 * Plugin Namespace: Plugin\migrate\views\argument

 *

 * @ingroup views_migration

 *

 * @Annotation

 */

class MigrateViewsArgument extends MigrateViewsHandlerAnnotationBase {

}

<?php

namespace Drupal\views_migration\Annotation;

/**

 * Defines a Migrate Views Argument Default plugin annotation object.

 *

 * Plugin Namespace: Plugin\migrate\views\argument_default

 *

 * @ingroup views_migration

 *

 * @Annotation

 */

class MigrateViewsArgumentDefault extends MigrateViewsAnnotationBase {

}