Support --init-replication-factor flag
--init-replication-factor
is a command-line argument of every instance.
replication_factor
is a property of the whole cluster
- Parse command line arguments.
- Persist it in the clusterwide config.
Pass the parameter to https://git.picodata.io/picodata/picodata/picodata/-/blob/929cead1235ad58e428c303f405af4e081baf0d7/src/traft/node.rs#L585