feat(parser): Add SearchHeader

We may want to remove the old SearchSubMenu node in the future but YouTube still uses it sometimes, so we will keep it for now.

Closes #452

src/parser/classes/SearchHeader.ts

@@ -0,0 +1,18 @@
+import { YTNode } from '../helpers.js';
+import { Parser, type RawNode } from '../index.js';
+import Button from './Button.js';
+import ChipCloud from './ChipCloud.js';
+
+export default class SearchHeader extends YTNode {
+  static type = 'SearchHeader';
+
+  chip_bar: ChipCloud | null;
+  search_filter_button: Button | null;
+
+  constructor(data: RawNode) {
+    super();
+    this.chip_bar = Parser.parseItem(data.chipBar, ChipCloud);
+    this.search_filter_button = Parser.parseItem(data.searchFilterButton, Button);
+    console.log(this.search_filter_button?.endpoint.open_popup);
+  }
+}