Add touch controller for enhanced touch event handling

Introduced a new 'touch_controller.js' file to manage touch events effectively. Updated 'package.json' to include the touch controller configuration. This addition enables immediate and comprehensive handling of touch interactions within the PWA.

assets/src/backgroundsync-form_controller.js

@@ -1,9 +1,9 @@
 'use strict';
 
-import { Controller } from '@hotwired/stimulus';
+import AbstractController from './abstract_controller.js';
 
 /* stimulusFetch: 'lazy' */
-export default class extends Controller {
+export default class extends AbstractController {
     static values = {
         params: {
             type: Object,