feat: Show banner message if Chatwoot update available (#3999)

Co-authored-by: Sivin Varghese <64252451+iamsivin@users.noreply.github.com>
Co-authored-by: Nithin David Thomas <1277421+nithindavid@users.noreply.github.com>
Co-authored-by: Fayaz Ahmed <15716057+fayazara@users.noreply.github.com>
Co-authored-by: Pranav <pranav@chatwoot.com>

app/javascript/dashboard/helper/localStorage.js

@@ -0,0 +1,17 @@
+class LocalStorage {
+  constructor(key) {
+    this.key = key;
+  }
+
+  store(allItems) {
+    localStorage.setItem(this.key, JSON.stringify(allItems));
+    localStorage.setItem(this.key + ':ts', Date.now());
+  }
+
+  get() {
+    let stored = localStorage.getItem(this.key);
+    return JSON.parse(stored) || [];
+  }
+}
+
+export default LocalStorage;