Feature: Typing Indicator on widget and dashboard (#811)

* Adds typing indicator for widget
* typing indicator for agents in dashboard

Co-authored-by: Pranav Raj Sreepuram <pranavrajs@gmail.com>

app/javascript/widget/api/conversation.js

@@ -19,4 +19,11 @@ const getConversationAPI = async ({ before }) => {
   return result;
 };
 
-export { sendMessageAPI, getConversationAPI, sendAttachmentAPI };
+const toggleTyping = async ({ typingStatus }) => {
+  return API.post(
+    `/api/v1/widget/conversations/toggle_typing${window.location.search}`,
+    { typing_status: typingStatus }
+  );
+};
+
+export { sendMessageAPI, getConversationAPI, sendAttachmentAPI, toggleTyping };