Migrate/investigate internal custom CKEditor plugins

Investigate migrating of our own custom CKEdigtor plugins, some of which we ship our product with.

1. Autosave plugin as mentioned in the tech design. This seems to need a rewrite/revisit
2. Check forge or internal bloomreach repositories, at least these 2 have been mentioned: Bynder and S3 manager
3. Check CodeMirror https://www.npmjs.com/package/@bloomreach/hippo-ckeditor-codemirror-plugin

There are many more plugins, some built for specific customers. Those need to be discovered and potentially attempted to be ported to TinyMCE equivalents.