Functionseedcordv0.10.6fetchUserFetches a Discord user by ID with error handling. Throws:A UserNotFound When the user doesn't exist async fetchUser( client: Client, userId: string ): Promise<User>async fetchUser( client: Client, userId: string ): Promise<User>Paramsclientclient: Clientclient: ClientThe Discord client instance userIduserId: stringuserId: stringThe Discord user ID