[sui-bridge-cli] Add latency to ping

[williampsmith]

Description

Adds latency_ms field to output of ping command of sui-bridge-cli

Test plan

https://gist.github.com/williampsmith/e314bc2c34957b938300ad0807775935

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Release notes

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• [ ] Protocol:
• [ ] Nodes (Validators and Full nodes):
• [ ] Indexer:
• [ ] JSON-RPC:
• [ ] GraphQL:
• [ ] CLI:
• [ ] Rust SDK:
• [ ] REST API:

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