chore: merge blocksuite source code (#9213)

blocksuite/playground/apps/starter/utils/test-worker.ts

@@ -0,0 +1,12 @@
+// This file is used to test blocksuite can run in a web worker. SEE: tests/worker.spec.ts
+
+import '@blocksuite/store';
+// import '@blocksuite/block-std'; // seems not working
+import '@blocksuite/blocks/schemas';
+
+globalThis.onmessage = event => {
+  const { data } = event;
+  if (data === 'ping') {
+    postMessage('pong');
+  }
+};