Sorting: Added sort set form manager UI JS

Extracted much code to be shared with the shelf books management UI

resources/js/components/index.ts

@@ -50,6 +50,7 @@ export {ShelfSort} from './shelf-sort';
 export {Shortcuts} from './shortcuts';
 export {ShortcutInput} from './shortcut-input';
 export {SortableList} from './sortable-list';
+export {SortSetManager} from './sort-set-manager'
 export {SubmitOnChange} from './submit-on-change';
 export {Tabs} from './tabs';
 export {TagManager} from './tag-manager';