refactor!: finish parser migration

Finally! :)

This removes all code related to the old parser.

#65

lib/parser/classes/MetadataRowContainer.js

@@ -0,0 +1,14 @@
+'use strict';
+
+const Parser = require('..');
+
+class MetadataRowContainer {
+  type = 'MetadataRowContainer';
+
+  constructor(data) {
+    this.rows = Parser.parse(data.rows);
+    this.collapsed_item_count = data.collapsedItemCount;
+  }
+}
+
+module.exports = MetadataRowContainer;