feat(parser): Update LiveChatMembershipItem (#836)

src/parser/classes/livechat/items/LiveChatMembershipItem.ts

@@ -9,16 +9,37 @@ export default class LiveChatMembershipItem extends YTNode {
 
   id: string;
   timestamp: number;
+  timestamp_usec: string;
+  timestamp_text?: Text;
+  header_primary_text?: Text;
   header_subtext: Text;
+  message?: Text;
   author: Author;
   menu_endpoint: NavigationEndpoint;
+  context_menu_accessibility_label: string;
 
   constructor(data: RawNode) {
     super();
     this.id = data.id;
     this.timestamp = Math.floor(parseInt(data.timestampUsec) / 1000);
+    this.timestamp_usec = data.timestampUsec;
+
+    if (Reflect.has(data, 'timestampText')) {
+      this.timestamp_text = new Text(data.timestampText);
+    }
+
+    if (Reflect.has(data, 'headerPrimaryText')) {
+      this.header_primary_text = new Text(data.headerPrimaryText);
+    }
+
     this.header_subtext = new Text(data.headerSubtext);
+
+    if (Reflect.has(data, 'message')) {
+      this.message = new Text(data.message);
+    }
+
     this.author = new Author(data.authorName, data.authorBadges, data.authorPhoto, data.authorExternalChannelId);
     this.menu_endpoint = new NavigationEndpoint(data.contextMenuEndpoint);
+    this.context_menu_accessibility_label = data.contextMenuAccessibility.accessibilityData.label;
   }
 }