refactor!: finish parser migration

Finally! :)

This removes all code related to the old parser.

#65

lib/parser/classes/MusicDetailHeader.js

@@ -0,0 +1,35 @@
+'use strict';
+
+const Text = require('./Text');
+const Thumbnail = require('./Thumbnail');
+const Parser = require('..');
+
+class MusicDetailHeader {
+  type = 'MusicDetailHeader';
+
+  constructor(data) {
+    this.title = new Text(data.title);
+    this.description = new Text(data.description);
+    this.subtitle = new Text(data.subtitle);
+    this.second_subtitle = new Text(data.secondSubtitle);
+    this.year = this.subtitle.runs.find((run) => (/^[12][0-9]{3}$/).test(run.text)).text;
+    this.song_count = this.second_subtitle.runs[0].text;
+    this.total_duration = this.second_subtitle.runs[2].text;
+    this.thumbnails = Thumbnail.fromResponse(data.thumbnail.croppedSquareThumbnailRenderer.thumbnail);
+    this.badges = Parser.parse(data.subtitleBadges);
+
+    const author = this.subtitle.runs.find((run) => run.endpoint.browse?.id.startsWith('UC'));
+
+    if (author) {
+      this.author = {
+        name: author.text,
+        channel_id: author.endpoint.browse.id,
+        endpoint: author.endpoint
+      };
+    }
+
+    this.menu = Parser.parse(data.menu);
+  }
+}
+
+module.exports = MusicDetailHeader;