feat(parser): add ConversationBar node

src/parser/classes/ConversationBar.ts

@@ -0,0 +1,16 @@
+import { YTNode } from '../helpers.js';
+import Parser, { RawNode } from '../index.js';
+import Message from './Message.js';
+
+class ConversationBar extends YTNode {
+  static type = 'ConversationBar';
+
+  availability_message: Message | null;
+
+  constructor(data: RawNode) {
+    super();
+    this.availability_message = Parser.parseItem<Message>(data.availabilityMessage, Message);
+  }
+}
+
+export default ConversationBar;