Issue #3246385 by lauriii, nod_, Wim Leers: [drupalMedia] Support captions on <drupal-media>

core/modules/ckeditor5/ckeditor5.ckeditor5.yml

core/modules/ckeditor5/css/drupalmedia.css

core/modules/ckeditor5/js/build/drupalImage.js

core/modules/ckeditor5/js/build/drupalMedia.js

...s/ckeditor5_plugins/drupalImage/src/drupalimageediting.js

...s/ckeditor5_plugins/drupalMedia/src/drupalmediacaption.js

...Media/src/drupalmediacaption/drupalmediacaptioncommand.js

...Media/src/drupalmediacaption/drupalmediacaptionediting.js

...rupalMedia/src/drupalmediacaption/drupalmediacaptionui.js

...s/ckeditor5_plugins/drupalMedia/src/drupalmediaediting.js

...s/ckeditor5/js/ckeditor5_plugins/drupalMedia/src/index.js

...keditor5/tests/src/FunctionalJavascript/CKEditor5Test.php

...es/ckeditor5/tests/src/FunctionalJavascript/ImageTest.php

...es/ckeditor5/tests/src/FunctionalJavascript/MediaTest.php

...ckeditor5/tests/src/Kernel/CKEditor5PluginManagerTest.php

...s/ckeditor5/tests/src/Kernel/SmartDefaultSettingsTest.php