refactor!: finish parser migration

Finally! :)

This removes all code related to the old parser.

#65

lib/parser/classes/ChannelMetadata.js

@@ -0,0 +1,25 @@
+'use strict';
+
+const Thumbnail = require('./Thumbnail');
+
+class ChannelMetadata {
+  type = 'ChannelMetadata';
+
+  constructor(data) {
+    this.title = data.title;
+    this.description = data.description;
+    this.url = data.channelUrl;
+    this.rss_urls = data.rssUrl;
+    this.vanity_channel_url = data.vanityChannelUrl;
+    this.external_id = data.externalId;
+    this.is_family_safe = data.isFamilySafe;
+    this.keywords = data.keywords;
+    this.avatar = Thumbnail.fromResponse(data.avatar);
+    this.available_countries = data.availableCountryCodes;
+    this.android_deep_link = data.androidDeepLink;
+    this.android_appindexing_link = data.androidAppindexingLink;
+    this.ios_appindexing_link = data.iosAppindexingLink;
+  }
+}
+
+module.exports = ChannelMetadata;