feat: notion OAuth setup (#11765)

Co-authored-by: Muhsin Keloth <muhsinkeramam@gmail.com>

app/javascript/dashboard/api/notion_auth.js

@@ -0,0 +1,14 @@
+/* global axios */
+import ApiClient from './ApiClient';
+
+class NotionOAuthClient extends ApiClient {
+  constructor() {
+    super('notion', { accountScoped: true });
+  }
+
+  generateAuthorization() {
+    return axios.post(`${this.url}/authorization`);
+  }
+}
+
+export default new NotionOAuthClient();