Add responsive width video formatter

#3 works perfectly, thank you!

Thanks for this issue, and the (mostly) working patch! I needed the same. Ported to the 3.0.x branch. Also, #9 is still using the deprecated entity_get_form_display(), converted to use \Drupal::service('entity_display.repository')->getFormDisplay(), instead.

This adds the missing schema definition for the new formatters.

Fixing phpcs errors introduced by this patch...

Sorry for the noise, missed one more violation introduced by this patch.

I just upgraded the site where I need this patch to 10.3.x and discovered we’re using yet more deprecated code in here. Opened an MR with patch #15 ported to D10.