ISSUE-4077: PIP-34 New subscription type Key_Shared

[sijie]

Original Issue: apache#4077

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There are many aspects to be covered for PIP-34, this is a task list tracker for this PIP

Tasks

• Core implementation ISSUE-15196: [broker] topic closed normally may still try to closeFencedTopicForcefully #4079
• Broker level flag to enable or disable this feature ISSUE-15305: RateLimiter#tryAcquire calculation problem. #4120
• Integration tests Bump pulsar version to 2.9.2.19-rc-0609 #4352
• Non persistent dispatcher ISSUE-16327: Namespace bundle xxx is being unloaded because of bundle unload failed somehow and topic backlog massive accumulation #4462
• Documentation ISSUE-15196: [broker] topic closed normally may still try to closeFencedTopicForcefully #4079
• Subscription level consumer selector setting.
• Client CLI
• Policy specify without message key
• Batch message ISSUE-16244: 2.8->2.10 version，start pulsar show exception：org.apache.pulsar.broker.web.RestException: Cluster already exists #4435
• Consumer priority
• Redelivery ordering guarantee ISSUE-16151: support retry strategy when produce message #4406
• dispatch messages to new consumer after exist consumer ack all messages dispatched
• send hash ring change events to consumers
• Reader support for sticky key range [Bump pulsar version to 2.11.2.5 #5928]
• Expose key shared consumer selector range in API [Bump pulsar version to 2.10.4.1 #5752]