fix: add missing imports

Signed-off-by: Jongmin Kim <[email protected]>

src/plugin/manager/iam/__init__.py

@@ -1,4 +1,4 @@
 from .service_account_manager import ServiceAccountManager
-# from .role_manager import RoleManager
-# from .permission_manager import PermissionManager
+from .role_manager import RoleManager
+from .permission_manager import PermissionManager
 # from .group_manager import GroupManager