feat: Create store to manage Portals (#5020)

Co-authored-by: Muhsin Keloth <muhsinkeramam@gmail.com>
Co-authored-by: Sivin Varghese <64252451+iamsivin@users.noreply.github.com>
Co-authored-by: Pranav Raj S <pranav@chatwoot.com>

app/javascript/dashboard/api/helpCenter/portals.js

@@ -0,0 +1,9 @@
+import ApiClient from '../ApiClient';
+
+class PortalsAPI extends ApiClient {
+  constructor() {
+    super('portals', { accountScoped: true });
+  }
+}
+
+export default new PortalsAPI();