Add compatibility with other fields extras

I just want to chime in here in case it is helpful to others.

We added a field_link_icon field to our menu links using the menu_item_fields module.

We want to display this icon in tb_megamenu along with the menu links.

As noted in this issue, there doesn't appear to be a way through the UI/config to do this.

We were able to achieve this by adding the following to our theme's tb-megamenu-item.html.twig (and installing the twig_tweak → module):

 {% set media_id = item.link.entity.field_link_icon.0.target_id %}
{{ drupal_image(media_id, 'thumbnail', {alt: ''}) }}

Thanks to @nkarhoff for helping me with this solution!