feat(parser): Add AlertWithButton (#486)

src/parser/classes/AlertWithButton.ts

@@ -0,0 +1,19 @@
+import Button from './Button.js';
+import Text from './misc/Text.js';
+import { YTNode } from '../helpers.js';
+import { Parser, type RawNode } from '../index.js';
+
+export default class AlertWithButton extends YTNode {
+  static type = 'AlertWithButton';
+
+  text: Text;
+  alert_type: string;
+  dismiss_button: Button | null;
+
+  constructor(data: RawNode) {
+    super();
+    this.text = new Text(data.text);
+    this.alert_type = data.type;
+    this.dismiss_button = Parser.parseItem(data.dismissButton, Button);
+  }
+}