Support Clickhouse as a replacement for Loki

[jotak]

Loki license AGPL isn't suitable for everyone. Clickhouse could be an alternative. The gap in the query language however is pretty big.

See also the discussion: https://cloud-native.slack.com/archives/C08HHHDA9ND/p1771880369315509?thread_ts=1771603468.006199&cid=C08HHHDA9ND