[VOTE] PIP-393: Improve performance of Negative Acknowledgement.

[thetumbled]

Hi, Pulsar Community.
  I would like to start the voting thread for PIP-393: Improve performance of 
Negative Acknowledgement.
  Proposal PR:  https://github.com/apache/pulsar/pull/23601
  Implementation PR: https://github.com/apache/pulsar/pull/23600
  Discussion Thread: 
https://lists.apache.org/thread/yojl7ylk7cyjxktq3cn8849hvmyv0fg8
 
Thanks,
Wenzhi Feng(thetumbled).