[VOTE]PIP-425: Support connecting with next available endpoint for multi-endpoint serviceUrls

[Aurora Twinkle]

Hi, Pulsar Community. I open a new PIP for support connecting with next
available endpoint for multi-endpoint serviceUrls. PIP:
https://github.com/apache/pulsar/pull/24394
DISCUSS: https://lists.apache.org/thread/44ztyhgm5ly6cljnlbnwrrowmk7jcrkj
  Thanks, Linlin Duan(AuroraTwinkle)