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`
}
        case Type::RESTART_REPLICA:
        {
            required_access.emplace_back(AccessType::SYSTEM_RESTART_REPLICA, query.database, query.table);
            break;
        }
        case Type::RESTART_REPLICAS:
        {
            required_access.emplace_back(AccessType::SYSTEM_RESTART_REPLICA);
            break;
        }
        case Type::FLUSH_DISTRIBUTED:
        {
            required_access.emplace_back(AccessType::SYSTEM_FLUSH_DISTRIBUTED, query.database, query.table);
            break;
        }
        case Type::FLUSH_LOGS:
        {
            required_access.emplace_back(AccessType::SYSTEM_FLUSH_LOGS);
            break;
        }
        case Type::STOP_LISTEN_QUERIES: break;
        case Type::START_LISTEN_QUERIES: break;
        case Type::UNKNOWN: break;
        case Type::END: break;
    }
    return required_access;
}
}