Implement a hook_page_attachments_alter() to pass on the moderation states as drupalSettings.gutenberg.nodeActions

Problem/Motivation

The workbench_moderation module should be comapitable with the gutenberg module.

Proposed resolution

• Implement a hook_page_attachments_alter() to pass on the moderation states into drupalSettings.gutenberg.nodeActions.
• Updated the \Drupal\workbench_moderation\Plugin\Field\FieldWidget\ModerationStateWidget::processActions to add attributes.id to the button element.