refactor: reorganize all components (#8303)

src/pull-refresh/index.ts

@@ -0,0 +1,7 @@
+import { installable } from '../utils';
+import _PullRefresh from './PullRefresh';
+
+const PullRefresh = installable(_PullRefresh);
+
+export default PullRefresh;
+export { PullRefresh };