feat: add support for retrieving YTMusic “related” tab

+ finish lyrics parser and implement all needed YouTube Music renderers

lib/parser/contents/classes/MusicCarouselShelfBasicHeader.js

@@ -0,0 +1,18 @@
+'use strict';
+
+const Text = require('./Text');
+const Thumbnail = require('./Thumbnail');
+
+class MusicCarouselShelfBasicHeader {
+  type = 'musicCarouselShelfBasicHeaderRenderer';
+  
+  constructor(data) {
+    this.title = new Text(data.title);
+    this.label = data.accessibilityData.accessibilityData.label;
+    
+    data.thumbnail && 
+      (this.thumbnail = new Thumbnail(data.thumbnail.musicThumbnailRenderer.thumbnail).thumbnails);
+  }
+}
+
+module.exports = MusicCarouselShelfBasicHeader;