Allow custom field formatter plugins to utilise this module

Ive tested/reviewed this - looks good to me.

Setup

1. Drupal 10.2.6
2. Latest version of this module
3. The proposed patch
4. A custom image formatter
5. Annotation as described in the OP

/**
 * Plugin implementation of the 'new image' formatter.
 *
 * @FieldFormatter(
 *   id = "new_image_formatter",
 *   label = @Translation("New Image Formatter"),
 *   lazy_loader = TRUE,
 *   field_types = {
 *     "image"
 *   }
 * )
 */

Works as I would expect, the option to assign lazy_loader is in the field display config. The markup includes the class the module provides,

<img loading="lazy" src="" width="480" height="368" alt="Alt text" data-src="/sites/default/files/styles/large/public/2024-08/Screenshot%202024-07-31%20at%2015.27.29.png?itok=vSuZn-oA" class="lozad" data-vd-id="element-qak7f">

RBTC

Thanks all! Merged; will be added to the next release

Automatically closed - issue fixed for 2 weeks with no activity.