[Vote] PIP-223: Add metrics for all Rest Endpoints

[Jiuming Tao]

Dear Pulsar Community,

Please review and vote on this PIP.

PIP link: https://github.com/apache/pulsar/issues/18560

Discuss thread:
https://lists.apache.org/thread/z74vcn0yolzzrcc4ftonm9j3nbk4pzxm

Thanks,
Tao Jiuming