Email (resend) element type

Based on the figma provided by Lee, we need to create a new element type for email. It's going to behave similarly to Twilio. What we need to consider additionally to what's there in the design: We need to research for a good open source editor that will allow us to create the content of the email. (Idea: ) The creation of the email content/editing email content will likely need to happen on a different page, so we don't overload the canvas with side functionality So, in the email node, we will select the message content or add a new one, this will take the user to a page where this new editor will exist. Once finished, it will take the user back to canvas with the email node highlighted and the message content already selected