Add a command that will freeze clickhouse-server process with STOP signal and wakeup it after specified amount of time.
This is needed for testing (fault injection).

Wakeup can be done with `ShellCommand` running `sleep N && kill -CONT pid`
|| type == Type::START_MERGES
        || type == Type::STOP_TTL_MERGES
        || type == Type::START_TTL_MERGES
        || type == Type::STOP_MOVES
        || type == Type::START_MOVES
        || type == Type::STOP_FETCHES
        || type == Type::START_FETCHES
        || type == Type::STOP_REPLICATED_SENDS
        || type == Type::START_REPLICATED_SENDS
        || type == Type::STOP_REPLICATION_QUEUES
        || type == Type::START_REPLICATION_QUEUES
        || type == Type::STOP_DISTRIBUTED_SENDS
        || type == Type::START_DISTRIBUTED_SENDS)
    {
        if (!table.empty())
            print_database_table();
        else if (!volume.empty())
            print_on_volume();
    }
    else if (type == Type::RESTART_REPLICA || type == Type::SYNC_REPLICA || type == Type::FLUSH_DISTRIBUTED)
    {
        print_database_table();
    }
    else if (type == Type::RELOAD_DICTIONARY)
        print_database_dictionary();
    else if (type == Type::DROP_REPLICA)
        print_drop_replica();
}
}