✨(app-desk) integrate keycloak

Integrate keycloak with the frontend.
We use the keycloak-js library to handle the
authentication and authorization.
We installed Zustand to handle the states of the
application.
We store the token and auth process in authStore.

src/frontend/app/desk/package.json

@@ -17,7 +17,8 @@
     "@openfun/cunningham-react": "2.4.0",
     "next": "14.0.4",
     "react": "18.2.0",
-    "react-dom": "18.2.0"
+    "react-dom": "18.2.0",
+    "zustand": "4.4.7"
   },
   "devDependencies": {
     "@testing-library/jest-dom": "6.2.0",
@@ -35,6 +36,7 @@
     "eslint-plugin-testing-library": "6.2.0",
     "jest": "29.7.0",
     "jest-environment-jsdom": "29.7.0",
+    "keycloak-js": "23.0.3",
     "prettier": "3.1.1",
     "stylelint": "16.1.0",
     "stylelint-config-standard": "36.0.0",