[Broker] Support configuration of the memory allocated to replication producer

[MMirelli]

Describe the bug

When replicating messages at high rates, brokers on the cluster originating message georeplication crash with the following error:

2022-05-19T18:35:09,916+0000 [BookKeeperClientWorker-OrderedExecutor-3-0] ERROR org.apache.pulsar.broker.service.persistent.PersistentReplicator - [persistent://tenant/namespace/perftest-partition-33][pulsar-cluster-src -> pulsar-cluster-dst] Error producing on remote broker
org.apache.pulsar.client.api.PulsarClientException$MemoryBufferIsFullError: Client memory buffer is full
	at org.apache.pulsar.client.impl.ProducerImpl.canEnqueueRequest(ProducerImpl.java:849) ~[com.datastax.oss-pulsar-client-original-2.10.0.3.jar:2.10.0.3]
	at org.apache.pulsar.client.impl.ProducerImpl.sendAsync(ProducerImpl.java:429) ~[com.datastax.oss-pulsar-client-original-2.10.0.3.jar:2.10.0.3]
	at org.apache.pulsar.broker.service.persistent.PersistentReplicator.lambda$readEntriesComplete$2(PersistentReplicator.java:369) ~[com.datastax.oss-pulsar-broker-2.10.0.3.jar:2.10.0.3]
	at java.util.concurrent.CompletableFuture.uniAcceptNow(CompletableFuture.java:753) ~[?:?]
	at java.util.concurrent.CompletableFuture.uniAcceptStage(CompletableFuture.java:731) ~[?:?]
	at java.util.concurrent.CompletableFuture.thenAccept(CompletableFuture.java:2108) ~[?:?]
	at org.apache.pulsar.broker.service.persistent.PersistentReplicator.readEntriesComplete(PersistentReplicator.java:367) ~[com.datastax.oss-pulsar-broker-2.10.0.3.jar:2.10.0.3]
	at org.apache.bookkeeper.mledger.impl.OpReadEntry.lambda$checkReadCompletion$2(OpReadEntry.java:156) ~[com.datastax.oss-managed-ledger-2.10.0.3.jar:2.10.0.3]
	at org.apache.bookkeeper.mledger.util.SafeRun$1.safeRun(SafeRun.java:32) [com.datastax.oss-managed-ledger-2.10.0.3.jar:2.10.0.3]
	at org.apache.bookkeeper.common.util.SafeRunnable.run(SafeRunnable.java:36) [com.datastax.oss-bookkeeper-common-4.14.5.1.0.0.jar:4.14.5.1.0.0]
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128) [?:?]
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628) [?:?]
	at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30) [io.netty-netty-common-4.1.76.Final.jar:4.1.76.Final]
	at java.lang.Thread.run(Thread.java:829) [?:?]

Currently, only the broker configuration replicationProducerQueueSize is in place to increase the replicating production rate. It would be convenient to have a configuration key setting the actual memory limit - what about replicationProducerMemoryLimit?.

To Reproduce
Steps to reproduce the behavior:

0. setup pulsar georeplication
1. start a pulsar-perf producer on cluster-src to produce to cluster-dst (with high rate, at least 15K msg / s)
2. observe the reported errors showing up on the cluster-src's brokers.

Desktop (please complete the following information):

• Pulsar helm deployment on GKE cluster

Additional context
This is likely a consequence of the changes introduced by #13344.

[gaozhangmin]

I will take a look at this.

[lhotari]

@gaozhangmin We are blocked by this issue and since you didn't create a PR, I have created one in #15723.