refactor: move affine utils into @affine/workspace (#2611)

packages/workspace/package.json

@@ -10,7 +10,6 @@
     "./providers": "./src/providers/index.ts",
     "./affine/*": "./src/affine/*.ts",
     "./affine/api": "./src/affine/api/index.ts",
-    "./affine/sync": "./src/affine/sync.js",
     "./affine/keck": "./src/affine/keck/index.ts"
   },
   "peerDependencies": {