Support Video Embed Field

Handler added and opened MR.

Please review.

The added logic for handling video_embed_field isn't working at the moment and would require a bit of changes.

I like the idea +1 fpr this one.

Thank you! Fixed both. Please review.

Tested with video embed field, the required attributes get added along with an external video link. Also, getting the Klaro links that confirm if user wants to load content from an external link.

Thank you for feedback and testing!

Merged to dev.