message: fix: add message content intent
diff: @@ -1069,6 +1069,10 @@ export enum GatewayIntents {
  */
  DirectMessageTyping = 1 << 14,
  + /**
  + * This intent will add `content` values to all message objects.
  + */
  + MessageContent = 1 << 15,
  /**
  * - GUILD_SCHEDULED_EVENT_CREATE
  * - GUILD_SCHEDULED_EVENT_UPDATE
  