Resolve #3338187 "Group v3 changes"

Closes #3338187

src/Annotation/GroupRelationshipCloner.php

+<?php
+
+declare(strict_types=1);
+
+namespace Drupal\group_clone\Annotation;
+
+use Drupal\Component\Annotation\Plugin;
+use Drupal\Core\Annotation\Translation;
+
+/**
+ * Defines a Group relationship cloner annotation object.
+ *
+ * Plugin Namespace: Plugin\GroupRelationshipCloner.
+ *
+ * @Annotation
+ */
+final class GroupRelationshipCloner extends Plugin {
+
+  /**
+   * The plugin ID.
+   *
+   * @var string
+   */
+  public string $id;
+
+  /**
+   * The human-readable name of the action plugin.
+   *
+   * @var label
+   *
+   * @ingroup plugin_translatable
+   */
+  public Translation $label;
+
+  /**
+   * The group relationship provider base plugin ID this cloner applies to.
+   *
+   * @var string
+   */
+  public string $content_plugin_id = '';
+
+}