void silc_sftp_server_set_monitor(SilcSFTP sftp,
                                      SilcSFTPMonitors monitors,
                                      SilcSFTPMonitor monitor,
                                      void *context);

    Sets monitor callback to monitor various request sent by a client.
    When request that has been set in the `monitors' is received the
    monitor callback will be called to notify the caller.