[discussion] Add Rich Text Editor component?

*⚠️ Info: This issue is for product research, to gather community input. In this [base-ui repo](https://github.com/mui/base-ui) we are, currently, focused on the core set of components needed to create a great design system, so the probability we build this in this repo is very low.*

## Summary

## Examples in other libraries

- https://github.com/ueberdosis/tiptap
- https://github.com/facebook/lexical
- https://github.com/ProseMirror/prosemirror
- https://github.com/slab/quill
- https://github.com/ianstormtaylor/slate

*([internal benchmark](https://www.notion.so/mui-org/x-Rich-Text-Editor-component-2fce8b9131154a96933c11a7fc89c17e))*

## Motivation

TBD

- User requests:
- /
- UI library requests:
- https://github.com/shadcn-ui/ui/issues/6037
- https://github.com/mui/mui-x/issues/513