feat(infra): new doc sync engine (#6205)

https://github.com/toeverything/AFFiNE/blob/eyhn/feat/new-sync/packages/common/infra/src/workspace/engine/doc/README.md

packages/frontend/core/src/testing.ts

@@ -34,7 +34,7 @@ export async function configureTestingEnvironment() {
     })
   );
 
-  await workspace.engine.sync.waitForSynced();
+  await workspace.engine.waitForSynced();
 
   const { page } = workspace.services.get(PageManager).open('page0');