**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'
```
{
    Stopwatch watch;
    auto & entry_replace = *entry.replace_range_entry;
    LOG_DEBUG(log, "Executing log entry {} to replace parts range {} with {} parts from {}.{}",
              entry.znode_name, entry_replace.drop_range_part_name, entry_replace.new_part_names.size(),
              entry_replace.from_database, entry_replace.from_table);
    auto metadata_snapshot = getInMemoryMetadataPtr();
    MergeTreePartInfo drop_range = MergeTreePartInfo::fromPartName(entry_replace.drop_range_part_name, format_version);
    
    bool replace = !LogEntry::ReplaceRangeEntry::isMovePartitionOrAttachFrom(drop_range);
    if (replace)
    {
        getContext()->getMergeList().cancelInPartition(getStorageID(), drop_range.partition_id, drop_range.max_block);
        queue.removePartProducingOpsInRange(getZooKeeper(), drop_range, entry);
    }
    else
    {
        drop_range = {};
    }
    struct PartDescription
    {
        PartDescription(