Add possibility to choose form mode

Re-rolled against 2.1.x

Missed the new file

Finally

I adapted the patch for the latest version.

The patch doesn't work with entity_browser 8.x-2.10 → because of the following changes https://www.drupal.org/node/3407702 →

Fixed here

What are your opinions on the new field-widget.

An update hook for existing installations can break individual configuration.
New installations then shall use it, so we would need to update the documentation?

Are we then having two form modes? Still the media_library one for our overview page and via CKEditor embed?

Changed deprecated hook field widget as described here →