Add tldraw embed (#3439)

* Test Tldraw embed

* Correct regex

* Correct alt for image

* Resize image to 120x120

shared/editor/embeds/Tldraw.tsx

@@ -0,0 +1,19 @@
+import * as React from "react";
+import Frame from "../components/Frame";
+import { EmbedProps as Props } from ".";
+
+function Tldraw(props: Props) {
+  return (
+    <Frame
+      {...props}
+      src={props.attrs.href}
+      title="Tldraw.com Embed"
+      referrerPolicy="origin"
+      border
+    />
+  );
+}
+
+Tldraw.ENABLED = [new RegExp("https?://www.tldraw.com/r/(.*)$")];
+
+export default Tldraw;