provide Attributes for the Key module

src/Attribute/KeyInput.php

+<?php
+
+namespace Drupal\key\Attribute;
+
+use Drupal\Component\Plugin\Attribute\Plugin;
+use Drupal\Core\StringTranslation\TranslatableMarkup;
+
+/**
+ * Defines the Key Input attribute.
+ */
+#[\Attribute(\Attribute::TARGET_CLASS)]
+class KeyInput extends Plugin {
+
+  /**
+   * Constructs a KeyInput attribute.
+   *
+   * @param string $id
+   *   The plugin ID of the key input.
+   * @param \Drupal\Core\StringTranslation\TranslatableMarkup $label
+   *   The human-readable name of the key input.
+   * @param \Drupal\Core\StringTranslation\TranslatableMarkup $description
+   *   The description of the key input.
+   */
+  public function __construct(
+    public readonly string $id,
+    public readonly TranslatableMarkup $label,
+    public readonly TranslatableMarkup $description,
+  ) {
+  }
+
+}