Adding an image url via Media Library should also populate image alt, height, and width text fields

My attempt at patching this.

Updated the patch because of a bug we've seen with certain schemas

3342759-4.patch

This patch is the same as 4 (it auto adds the image height and width when inserting an image via the Drupal module), but this is built from 9.1.x.

The check we had for 'image.src' was catching other fields we didn't expect. We've narrowed it down to only look for the .image.src field and added an additional fallback if the corresponding field isn't available in json editor.