feat: File attachments (#3031)

* stash

* refactor, working in non-collab + collab editor

* attachment styling

* Avoid crypto require in browser

* AttachmentIcon, handling unknown types

* Do not allow attachment creation for file sizes over limit

* Allow image as file attachment

* Upload placeholder styling

* lint

* Refactor: Do not use placeholder for file attachmentuploads

* Add loading spinner

* fix: Extra paragraphs around attachments on insert

* Bump editor

* fix build error

* Remove attachment placeholder when upload fails

* Remove unused styles

* fix: Attachments on shared pages

* Merge fixes

shared/editor/components/Image.tsx

@@ -0,0 +1,14 @@
+import * as React from "react";
+import { cdnPath } from "../../utils/urls";
+
+type Props = {
+  alt: string;
+  src: string;
+  title?: string;
+  width?: number;
+  height?: number;
+};
+
+export default function Image({ src, alt, ...rest }: Props) {
+  return <img src={cdnPath(src)} alt={alt} {...rest} />;
+}