Hi, Pulsar Community.
I create a PR to remove the unused util class ConcurrentSortedLongPairSet.
https://github.com/apache/pulsar/pull/23202
ConcurrentSortedLongPairSet has been replaced by
ConcurrentBitmapSortedLongPairSet in #17804 since version 2.9.x, and there is
no usage of it anymore.
If you have any concern on this pr, feel free to leave comments.Thanks, Wenzhi Feng(thetumbled)
