Bump version to 1.1.1 and update related manifests

- Updated version in package.json and package-lock.json to 1.1.1
- Changed version in deployment manifest files to 1.1.1
- Added new elements.xml for MegaMenu Application Customizer

config/package-solution.json

@@ -3,9 +3,22 @@
   "solution": {
     "name": "mega-menu-client-side-solution",
     "id": "f4660e06-ce08-43ee-bfb7-5c4464e01133",
-    "version": "1.1.0.0",
+    "version": "1.1.1.0",
     "includeClientSideAssets": true,
-    "skipFeatureDeployment": false
+    "skipFeatureDeployment": false,
+    "features": [
+      {
+        "title": "MegaMenu extension registration",
+        "description": "Registers the MegaMenu Application Customizer in the host web.",
+        "id": "1e4fdc74-8053-48b2-a15b-e975d61eb71f",
+        "version": "1.1.1.0",
+        "assets": {
+          "elementManifests": [
+            "elements.xml"
+          ]
+        }
+      }
+    ]
   },
   "paths": {
     "zippedPackage": "solution/mega-menu.sppkg"