separate setting actions and reducers

src/background/actions/setting.js

@@ -0,0 +1,13 @@
+import actions from '../actions';
+import * as settingsStorage from 'shared/settings/storage';
+
+const load = () => {
+  return settingsStorage.loadValue().then((value) => {
+    return {
+      type: actions.SETTING_SET_SETTINGS,
+      value,
+    };
+  });
+};
+
+export { load };