new cli command to update plugin service config

Summary

Adds new CLI command (picodata plugin) with additional new subcommand (picodata plugin configure) that updates plugin configurations. Also fixes errors in the log when trying to change the configuration on a disabled plugin service, which are successfully applied.

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• Close #705, #1062 (closed)
• Cherry-pick to: 24.7
• Docs follow-up: docs#402