Feature: Slack - receive messages, create threads, send replies (#974)

Co-authored-by: Pranav Raj S <pranav@thoughtwoot.com>

app/javascript/dashboard/api/integrations.js

@@ -0,0 +1,21 @@
+/* global axios */
+
+import ApiClient from './ApiClient';
+
+class IntegrationsAPI extends ApiClient {
+  constructor() {
+    super('integrations/apps', { accountScoped: true });
+  }
+
+  connectSlack(code) {
+    return axios.post(`${this.baseUrl()}/integrations/slack`, {
+      code: code,
+    });
+  }
+
+  delete(integrationId) {
+    return axios.delete(`${this.baseUrl()}/integrations/${integrationId}`);
+  }
+}
+
+export default new IntegrationsAPI();