[core] Add email layout primitives

[oliviertassinari]

Summary

Support layout primitive to create emails.

Examples

• https://get.foundation/emails.html
• https://mjml.io/
• https://demo.react.email/preview/magic-links/aws-verify-email?view=desktop&lang=jsx

Motivation

• maybe I'm using Pigment CSS but mjml is too limited, I want to use the same primitives.

Search keywords: -

[Janpot]

If we continue further on authentication components and fully want to support a credentials based flow, at some point we'll need to provide a straightforward way to tie password reset and registration emails into the application theme and branding. Similar for email authentication with magic link emails. That seems to be a logical angle into this feature from Toolpad core.

[samueltrevor]

What about a drag-and-drop email editor that generates react-email code?

If there's interest, I could release it within a few weeks. Please upvote or comment if you're interested.

Here's a prototype of the email editor.