Add "url to media thumbnail" formatter for media reference fields

For image field, we get two formatters:

1. image: renders image in <img>
2. Url to image: provides the URL. Use case: To render an image as background image through inline styling in template.

But in case of referenced media field : Thumbnail formatter is present to render the media in <img>.

This is a feature request to add URL to media thumbnail for media reference fields which provides functionality similar to URL to image formatter in image field.