Implement ClickHouse replicated cluster option for simulated omicron

[karencfv]

New --replicated flag for the omicron-dev ch-run command. This will allow us to spin up a ClickHouse replicated cluster containing 2 replicas and 3 keepers.

$ cargo run --bin omicron-dev -- ch-run --replicated
    Finished dev [unoptimized + debuginfo] target(s) in 0.31s
     Running `target/debug/omicron-dev ch-run --replicated`
omicron-dev: running ClickHouse cluster with configuration files:
 replicas: /home/{user}/src/omicron/oximeter/db/src/configs/replica_config.xml
 keepers: /home/{user}/src/omicron/oximeter/db/src/configs/keeper_config.xml
omicron-dev: ClickHouse cluster is running with PIDs: 1113482, 1113681, 1113387, 1113451, 1113419
omicron-dev: ClickHouse HTTP servers listening on ports: 8123, 8124
omicron-dev: using /tmp/.tmpFH6v8h and /tmp/.tmpkUjDji for ClickHouse data storage

Related: #4148

[karencfv]

Thanks for the review @bnaecker! I think I've addressed all your comments :)

[bnaecker]

Looks good, thanks!