[META] WYSIWYG in Experience Builder

Problem/Motivation

#3452314: [MR Only] provide UI foundation with Drag and Drop + panels aka https://git.drupalcode.org/project/experience_builder/-/merge_requests/33 added SdcController to provide a skeleton of backend listings. In a retrospective review a few issues were flagged.

Use cases

Functional Requirements

1. Support WYSIWYG (CKEditor 5) text fields as SDC/code component props, with only the ability for the SDC developer to specify “inline” or “block”, and NO support for matching an “inline HTML” SDC prop against existing text fields → see #3517735: [later phase] [needs upstream feature] Make `x-formatting-context: inline` work.

Non-Functional Requirements or Constraints

1. Must be architected to allow translation support to be added in the future.
2. Must comply with product requirement 14. Configuration management
3. Must be architected to allow in-place editing to be added in the future with low probability of needing breaking changes. (Too complex/big of a feature to guarantee this.)

Proposed resolution

(Numbered lists must happen one after the other, bulleted lists can happen in parallel.)

1. • ✅ Missing shape matching infrastructure + text formats/editors: #3467959: SDC and code component props should be able to receive HTML, editable in formatted text fields+widgets
   • ✅ Make CKE5 work in content entity form: #3512867: CKEditor 5 not loading on formatted text Field Widgets in the content entity form
2. • ✅ Make CKE5 work in component instance form: #3484395: CKEditor 5 not loading on formatted text Field Widgets in the component instance form
   • ✅ Allow creating code components that use the prop shape #3467959 introduced: #3519135: Evolve "Text area" prop type to "Formatted text" in code editor, make use of new prop shape with `contentMediaType: text/html`, ensure formatted text can render inside code components
3. Make the full range of CKEditor 5 functionality work in the content entity form:
   • #3519146: Address CKEditor 5 "more items" bar contents not being fully visible
   • #3519141: Dialogs opened by CKEditor 5 need to be rendered with admin theme
4. Use CKEditor 5 for authoring an example value
   • #3521724: Use CKEditor 5 for example value in code editor formatted text prop

User interface changes

1. CKEditor 5 works in the component instance form for the 2 restricted text formats
2. CKEditor 5 works completely in the content entity form