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/embeds/Vimeo.tsx

@@ -1,5 +1,5 @@
 import * as React from "react";
-import Frame from "./components/Frame";
+import Frame from "../components/Frame";
 import { EmbedProps as Props } from ".";
 
 const URL_REGEX = /(http|https)?:\/\/(www\.)?vimeo.com\/(?:channels\/(?:\w+\/)?|groups\/([^/]*)\/videos\/|)(\d+)(?:\/|\?)?([\d\w]+)?/;