feat: Ability to improve drafts in the editor using GPT integration (#6957)

ref: https://github.com/chatwoot/chatwoot/issues/6436
fixes: https://linear.app/chatwoot/issue/CW-1552/ability-to-rephrase-text-in-the-editor-using-gpt-integration

---------

Co-authored-by: Sojan <sojan@pepalo.com>
Co-authored-by: Nithin David Thomas <1277421+nithindavid@users.noreply.github.com>

app/javascript/dashboard/api/integrations/openapi.js

@@ -0,0 +1,23 @@
+/* global axios */
+
+import ApiClient from '../ApiClient';
+
+class OpenAIAPI extends ApiClient {
+  constructor() {
+    super('integrations', { accountScoped: true });
+  }
+
+  processEvent({ name = 'rephrase', content, tone, hookId }) {
+    return axios.post(`${this.url}/hooks/${hookId}/process_event`, {
+      event: {
+        name: name,
+        data: {
+          tone,
+          content,
+        },
+      },
+    });
+  }
+}
+
+export default new OpenAIAPI();