[RIP-19] Server-side rebalance, lightweight consumer client support

[duhenglucky]

[RIP 19] Server side rebalance, lightweight consumer client support

What is the purpose of the change

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Brief changelog

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Verifying this change

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[coveralls]

Coverage decreased (-1.2%) to 52.583% when pulling 48fa70b on pop_consumer into df1d93f on 5.0.0-preview.

[vongosling]

resolve conflict, and we could review after merge it, release it in 4.9.0 after 4.8.1

[codecov-commenter]

Codecov Report

Merging #2867 (48fa70b) into 5.0.0-preview (df1d93f) will decrease coverage by 1.48%.
The diff coverage is 30.18%.

@@                 Coverage Diff                 @@
##             5.0.0-preview    #2867      +/-   ##
===================================================
- Coverage            47.97%   46.49%   -1.49%     
- Complexity            4570     4789     +219     
===================================================
  Files                  552      591      +39     
  Lines                36628    40253    +3625     
  Branches              4844     5454     +610     
===================================================
+ Hits                 17573    18716    +1143     
- Misses               16832    19071    +2239     
- Partials              2223     2466     +243     

Impacted Files	Coverage Δ
...balance/AllocateMessageQueueAveragelyByCircle.java	0.00% <0.00%> (ø)
...nt/impl/consumer/ConsumeMessageOrderlyService.java	38.84% <0.00%> (-0.15%)	⬇️
...impl/consumer/ConsumeMessagePopOrderlyService.java	0.00% <0.00%> (ø)
...rocketmq/client/impl/consumer/PopProcessQueue.java	0.00% <0.00%> (ø)
...ache/rocketmq/client/impl/consumer/PopRequest.java	0.00% <0.00%> (ø)
.../rocketmq/client/impl/consumer/PullAPIWrapper.java	42.14% <0.00%> (-8.29%)	⬇️
...cketmq/client/impl/consumer/RebalancePullImpl.java	19.23% <0.00%> (-4.58%)	⬇️
...rocketmq/client/impl/factory/MQClientInstance.java	50.00% <0.00%> (-2.41%)	⬇️
...in/java/org/apache/rocketmq/common/KeyBuilder.java	0.00% <0.00%> (ø)
...va/org/apache/rocketmq/common/PopAckConstants.java	0.00% <0.00%> (ø)
... and 129 more

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