Restructure omni services and add Chatwoot research snapshot

research/chatwoot/app/javascript/dashboard/api/attributes.js

@@ -0,0 +1,14 @@
+/* global axios */
+import ApiClient from './ApiClient';
+
+class AttributeAPI extends ApiClient {
+  constructor() {
+    super('custom_attribute_definitions', { accountScoped: true });
+  }
+
+  getAttributesByModel() {
+    return axios.get(this.url);
+  }
+}
+
+export default new AttributeAPI();