fix: introduce newAccountAssets

Author: sahar-fehri

packages/assets-controllers/src/MultichainAssetsController/index.ts

@@ -10,4 +10,5 @@ export type {
   MultichainAssetsControllerActions,
   MultichainAssetsControllerMessenger,
   MultichainAssetsControllerNewAccountAssetsEvent,
+  MultichainAssetsControllerEvents,
 } from './MultichainAssetsController';