[feat]PIP-410: Add a metric to track publish buffer usage. #23109

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5 warnings

Summary: Tests in class org.apache.pulsar.proxy.server.UnauthedAdminProxyHandlerTest created 1 new threads. There are now 10 threads in total.

Summary: Tests in class org.apache.pulsar.proxy.server.ProxyStuckConnectionTest created 1 new threads. There are now 10 threads in total.

Summary: Tests in class org.apache.pulsar.proxy.server.ProxyIsAHttpProxyTest created 1 new threads. There are now 10 threads in total.

Summary: Tests in class org.apache.pulsar.proxy.server.ProxyDisableZeroCopyTest created 1040 new threads. There are now 1049 threads in total.

Summary: Tests in class org.apache.pulsar.proxy.server.ProxyTest created 1080 new threads. There are now 1089 threads in total.