refactor!: move everything that needs parsing to parser and improve oauth system

lib/parser/youtube/others/ChannelMetadata.js

@@ -0,0 +1,20 @@
+'use strict';
+
+class ChannelMetadata {
+  static parse(data) {
+    return {
+      title: data.channelMetadataRenderer.title,
+      description: data.channelMetadataRenderer.description,
+      metadata: {
+        url: data.channelMetadataRenderer?.channelUrl,
+        rss_urls: data.channelMetadataRenderer?.rssUrl,
+        vanity_channel_url: data.channelMetadataRenderer?.vanityChannelUrl,
+        external_id: data.channelMetadataRenderer?.externalId,
+        is_family_safe: data.channelMetadataRenderer?.isFamilySafe,
+        keywords: data.channelMetadataRenderer?.keywords
+      }
+    }
+  }
+}
+
+module.exports = ChannelMetadata;