Adds unread message bubbles for widget (#943)

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

app/javascript/sdk/DOMHelpers.js

@@ -61,3 +61,7 @@ export const addClass = (elm, classes) => {
 export const toggleClass = (elm, classes) => {
   classHelper(classes, 'toggle', elm);
 };
+
+export const removeClass = (elm, classes) => {
+  classHelper(classes, 'remove', elm);
+};