refactor: migrate parsers to TS (#133)

* dev: finish top-level parsers TS migration

* dev: migrate menu renderers to TS

* chore: fix ts errors

* dev: finish ts migration 🎉

src/parser/classes/MetadataRowHeader.ts

@@ -0,0 +1,17 @@
+import Text from './misc/Text';
+import { YTNode } from '../helpers';
+
+class MetadataRowHeader extends YTNode {
+  static type = 'MetadataRowHeader';
+
+  content: Text;
+  has_divider_line: boolean;
+
+  constructor(data: any) {
+    super();
+    this.content = new Text(data.content);
+    this.has_divider_line = data.hasDividerLine;
+  }
+}
+
+export default MetadataRowHeader;