**Use case**

Currently, `system.replicas` table has `total_replicas` and `active_replicas` columns which are useful to check/alert when some replicas are down. One problem, these columns are numbers. They tell when there is a problem, but you need to further check ZooKeeper or query all the nodes to detect what exact replicas (hosts) are down/inactive/have problems.

**Describe the solution you'd like**

Add a replicas column maybe as a map which would contain the replica name, and it's status. Or, add 2 array columns with `replica_names` and `active_replica_names`

**Alternative**

Something along the line

```sql
select path, value from system.zookeeper where path IN (
    select concat(path, '/', name) from system.zookeeper where path in (select concat(zookeeper_path, '/replicas') from system.replicas)
)
and name = 'is_active'
```
Coordination::Stat is_lost_stat_new;
        zookeeper->get(fs::path(source_path) / "is_lost", &is_lost_stat_new);
        if (is_lost_stat_new.version != source_is_lost_stat.version)
            throw Exception(ErrorCodes::REPLICA_STATUS_CHANGED, "Cannot clone {}, because it suddenly become lost", source_replica);
    }
    tryRemovePartsFromZooKeeperWithRetries(parts_to_remove_from_zk);
    auto local_active_parts = getDataParts();
    DataPartsVector parts_to_remove_from_working_set;
    for (const auto & part : local_active_parts)
    {
        if (active_parts_set.getContainingPart(part->name).empty())
        {
            parts_to_remove_from_working_set.emplace_back(part);
            LOG_WARNING(log, "Source replica does not have part {}. Removing it from working set.", part->name);
        }
    }
    if (getSettings()->detach_old_local_parts_when_cloning_replica)
    {
        auto metadata_snapshot = getInMemoryMetadataPtr();
        for (const auto & part : parts_to_remove_from_working_set)
        {
            LOG_INFO(log, "Detaching {}", part->relative_path);
            part->makeCloneInDetached("clone", metadata_snapshot);
        }
    }
    removePartsFromWorkingSet(parts_to_remove_from_working_set, true);
    for (const String & name : active_parts)