refactor: improve livechat parser & add remaining action nodes (#285)

* refactor: improve live chat parsers & add missing nodes

* chore: update example and docs

* docs: rephrasing/formatting

* chore: remove unneeded test (unrelated)

src/parser/classes/UpsellDialog.ts

@@ -0,0 +1,25 @@
+import Parser from '..';
+import { YTNode } from '../helpers';
+import type Button from './Button';
+import Text from './misc/Text';
+
+class UpsellDialog extends YTNode {
+  static type = 'UpsellDialog';
+
+  message_title: Text;
+  message_text: Text;
+  action_button: Button | null;
+  dismiss_button: Button | null;
+  is_visible: boolean;
+
+  constructor(data: any) {
+    super();
+    this.message_title = new Text(data.dialogMessageTitle);
+    this.message_text = new Text(data.dialogMessageText);
+    this.action_button = Parser.parseItem<Button>(data.actionButton);
+    this.dismiss_button = Parser.parseItem<Button>(data.dismissButton);
+    this.is_visible = data.isVisible;
+  }
+}
+
+export default UpsellDialog;