[next] Embed plus (#1877)

* Implement StreamEmbed instance and rename library to coral

* Add article & articleButton.html, only show embed htmls in production

* Respect assetURL

* Add tests

* Add parseHashQuery

* Fix permalink query and integration tests

* Fix permalink URL

* Remove optionalparams from pym

* Scroll when showing permalink view

* Implement autoRender

* AutoRender immediately when render permalink

* Add test for `showPermalink` event

* Add comment

src/core/client/embed/PymControl.ts

@@ -2,13 +2,18 @@ import pym from "pym.js";
 
 import { CleanupCallback, Decorator } from "./decorators";
 
-interface PymControlConfig {
+export interface PymControlConfig {
   id: string;
   url: string;
   title: string;
   decorators?: ReadonlyArray<Decorator>;
 }
 
+export type PymControlFactory = (config: PymControlConfig) => PymControl;
+
+export const defaultPymControlFactory: PymControlFactory = config =>
+  new PymControl(config);
+
 export default class PymControl {
   private pym: pym.Parent;
   private cleanups: CleanupCallback[];
@@ -20,6 +25,7 @@ export default class PymControl {
       title: config.title,
       id: `${config.id}_iframe`,
       name: `${config.id}_iframe`,
+      optionalparams: "",
     });
 
     this.cleanups = decorators