feat(parser): Update LiveChatViewerEngagementMessage (#856)

Update `LiveChatViewerEngagementMessage` to extend `YTNode` rather than
`LiveChatMessageBase` to better align with the latest data provided by
Innertube.

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

@@ -1,19 +1,47 @@
 import { Parser } from '../../../index.js';
-import { LiveChatMessageBase } from './LiveChatTextMessage.js';
 import type { RawNode } from '../../../index.js';
-import type { YTNode } from '../../../helpers.js';
+import { YTNode } from '../../../helpers.js';
+import NavigationEndpoint from '../../NavigationEndpoint.js';
+import Text from '../../misc/Text.js';
 
-export default class LiveChatViewerEngagementMessage extends LiveChatMessageBase {
+export default class LiveChatViewerEngagementMessage extends YTNode {
   static type = 'LiveChatViewerEngagementMessage';
 
+  id: string;
+  timestamp?: number;
+  timestamp_usec?: string;
   icon_type?: string;
-  action_button: YTNode;
+  message: Text;
+  action_button: YTNode | null;
+  menu_endpoint?: NavigationEndpoint;
+  context_menu_accessibility_label?: string;
 
   constructor(data: RawNode) {
-    super(data);
+    super();
+    this.id = data.id;
+
+    if (Reflect.has(data, 'timestampUsec')) {
+      this.timestamp = Math.floor(parseInt(data.timestampUsec) / 1000);
+      this.timestamp_usec = data.timestampUsec;
+    }
+
     if (Reflect.has(data, 'icon') && Reflect.has(data.icon, 'iconType')) {
       this.icon_type = data.icon.iconType;
     }
+
+    this.message = new Text(data.message);
     this.action_button = Parser.parseItem(data.actionButton);
+
+    if (Reflect.has(data, 'contextMenuEndpoint')) {
+      this.menu_endpoint = new NavigationEndpoint(data.contextMenuEndpoint);
+    }
+
+    if (
+      Reflect.has(data, 'contextMenuAccessibility') &&
+      Reflect.has(data.contextMenuAccessibility, 'accessibilityData') &&
+      Reflect.has(data.contextMenuAccessibility.accessibilityData, 'label')
+    ) {
+      this.context_menu_accessibility_label = data.contextMenuAccessibility.accessibilityData.label;
+    }
   }
 }