feat: migrate all playlist renderers to TypeScript

src/parser/classes/PlaylistVideoThumbnail.ts

@@ -0,0 +1,15 @@
+import Thumbnail from './misc/Thumbnail';
+import { YTNode } from '../helpers';
+
+class PlaylistVideoThumbnail extends YTNode {
+  static type = 'PlaylistVideoThumbnail';
+
+  thumbnail: Thumbnail[];
+
+  constructor(data: any) {
+    super();
+    this.thumbnail = Thumbnail.fromResponse(data.thumbnail);
+  }
+}
+
+export default PlaylistVideoThumbnail;