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`
break;
        case Type::START_REPLICATED_SENDS:
            startStopAction(ActionLocks::PartsSend, true);
            break;
        case Type::STOP_REPLICATION_QUEUES:
            startStopAction(ActionLocks::ReplicationQueue, false);
            break;
        case Type::START_REPLICATION_QUEUES:
            startStopAction(ActionLocks::ReplicationQueue, true);
            break;
        case Type::STOP_DISTRIBUTED_SENDS:
            startStopAction(ActionLocks::DistributedSend, false);
            break;
        case Type::START_DISTRIBUTED_SENDS:
            startStopAction(ActionLocks::DistributedSend, true);
            break;
        case Type::DROP_REPLICA:
            dropReplica(query);
            break;
        case Type::SYNC_REPLICA:
            syncReplica(query);
            break;
        case Type::FLUSH_DISTRIBUTED:
            flushDistributed(query);
            break;
        case Type::RESTART_REPLICAS:
            restartReplicas(system_context);
            break;
        case Type::RESTART_REPLICA:
            if (!tryRestartReplica(table_id, system_context))