feat: Add search functionality for public portal (#5683)

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

app/javascript/portal/api/article.js

@@ -0,0 +1,14 @@
+import axios from 'axios';
+
+class ArticlesAPI {
+  constructor() {
+    this.baseUrl = '';
+  }
+
+  searchArticles(portalSlug, locale, query) {
+    let baseUrl = `${this.baseUrl}/hc/${portalSlug}/${locale}/articles.json?query=${query}`;
+    return axios.get(baseUrl);
+  }
+}
+
+export default new ArticlesAPI();