[FR] CKEditor support

[thulstrup]

Is your feature request related to a problem? Please describe.

With Craft CMS transitioning from Redactor to CKEditor, the Rich Variables plugin lacks integration with CKEditor, hindering users from inserting variables directly into their content using the new editor.

Describe the solution you would like

I'd like the Rich Variables plugin to be updated to support CKEditor, so users can easily insert variables as they currently do with Redactor.