Implement cluster topology CLI command

[ayushrichh]

Summary

Adds a new cluster topology CLI command that:

• Loads a cluster TOML configuration file
• Prints the configured cluster topology
• Displays each node's ID and RPC address
• Handles empty cluster configurations gracefully

Testing

• cargo build
• cargo run --bin openlake -- cluster topology --help

[ayushrichh]

While working on this PR, I noticed that a more complete implementation of the cluster topology command has since been merged into main.

My implementation now conflicts with the current upstream version of mod.rs and topology.rs.

Could you please advise whether this PR should be closed as superseded, or if there are any remaining improvements you'd like me to contribute to the topology command?