[VOTE] PIP-343: Use picocli instead of jcommander

[Zixuan Liu]

Hello,

A new proposal to improve the CLI user experience.

PIP: https://github.com/apache/pulsar/pull/22181
Discussion thread:
https://lists.apache.org/thread/ydg1q064cd11pxwz693frtk4by74q32f

PR: https://github.com/apache/pulsar/pull/22209

Thanks,
Zixuan