message: Document thread.create_timestamp
diff: @@ -10,4 +10,6 @@ export interface ThreadMetadata {
  locked?: boolean;
  /** whether non-moderators can add other non-moderators to a thread; only available on private threads */
  invitable?: boolean;
  + /** Timestamp when the thread was created; only populated for threads created after 2022-01-09 */
  + createTimestamp: number;
  }
  