Support props that can use wysiwyg widgets

Overview

There are requests to make the redux field widgets work with widgets such as the formatted text one used by TextLongItem, but there is currently no way to add a prop that uses such a widget, so we need to get that working before reduxing it can be explored

Proposed resolution

Add a prop to the all props test sdc that is editable by a Ckeditor5 wysiwyg

User interface changes