[WC-2533][WC-2581] RTE v4: quill v2

[gjulivan]

Pull request type

Breaking change this will be version 4.0 of Rich Text Editor. new rich text editor using Quill V2.

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Description

Due to the license changes on TinyMCE 7.0, we can't upgrade to tinymce 7.0

Thus, we decide to continue using Quill (as in Rich Text v 1) which has been back with their Version 2.0.

What should be covered while testing?

everything.

CSP, a11y, functionality.

[samuelreichert]

RTE v4 is looking good! 🎉