Resolve #3511503 "Plugin as attributes"

Closes #3511503

src/Attribute/DatasetDestination.php

+<?php
+
+declare(strict_types=1);
+
+namespace Drupal\data_pipelines\Attribute;
+
+use Drupal\Component\Plugin\Attribute\Plugin;
+use Drupal\Core\StringTranslation\TranslatableMarkup;
+
+/**
+ * Defines a DatasetDestination attribute for plugin discovery.
+ */
+#[\Attribute(\Attribute::TARGET_CLASS)]
+class DatasetDestination extends Plugin {
+
+  /**
+   * Constructs a DatasetDestination attribute.
+   *
+   * @param string $id
+   *   The plugin ID.
+   * @param \Drupal\Core\StringTranslation\TranslatableMarkup $label
+   *   The plugin label.
+   * @param \Drupal\Core\StringTranslation\TranslatableMarkup|null $description
+   *   (optional) A description for the destination plugin.
+   */
+  public function __construct(
+    public readonly string $id,
+    public readonly TranslatableMarkup $label,
+    public readonly ?TranslatableMarkup $description = NULL,
+  ) {}
+
+}