feat: cloud sync playground (#662)

* feat: add workspace playground page
* feat: add all demands to playground

Co-authored-by: tzhangchi <terry.zhangchi@outlook.com>

tests/change-page-mode.spec.ts

@@ -1,7 +1,6 @@
 import { test, expect } from '@playwright/test';
 import { loadPage } from './libs/load-page';
 import { clickPageMoreActions } from './libs/page-logic';
-
 loadPage();
 
 test.describe('Change page mode(Paper or Edgeless)', () => {