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/index.tsx

@@ -1,6 +1,7 @@
 import * as React from "react";
 import styled from "styled-components";
 import { EmbedDescriptor } from "@shared/editor/types";
+import Image from "../components/Image";
 import Abstract from "./Abstract";
 import Airtable from "./Airtable";
 import Bilibili from "./Bilibili";
@@ -35,7 +36,6 @@ import Typeform from "./Typeform";
 import Vimeo from "./Vimeo";
 import Whimsical from "./Whimsical";
 import YouTube from "./YouTube";
-import Image from "./components/Image";
 
 export type EmbedProps = {
   isSelected: boolean;