support RequestCode GET_CONSUMER_STATUS_FROM_CLIENT

[NeonToo]

What is the purpose of the change

Support RequestCode GET_CONSUMER_STATUS_FROM_CLIENT

• Broker RequestCode INVOKE_BROKER_TO_GET_CONSUMER_STATUS will invoke each individual consumer to get
  which message queues the consumer instance is processing
• Client is supposed to handle GET_CONSUMER_STATUS_FROM_CLIENT from Broker to return the Map of <MessageQueue, MemoryOffset> for the purpose of previous step

Brief changelog

• push_consumer pull_consumer implements getConsumerStatus(topic string, group string) *ConsumerStatus
• offset_store implements getMQOffsetMap(topic string) map[primitive.MessageQueue]int64 for consumer to get the MQOffsetMap

Verifying this change

XXXX

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[codecov-commenter]

Codecov Report

Merging #985 (bd5a6de) into master (896a8a3) will decrease coverage by 0.32%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master     #985      +/-   ##
==========================================
- Coverage   23.32%   23.00%   -0.33%     
==========================================
  Files          52       52              
  Lines        7266     7369     +103     
==========================================
  Hits         1695     1695              
- Misses       5339     5442     +103     
  Partials      232      232              

Impacted Files	Coverage Δ
consumer/mock_offset_store.go	30.61% <0.00%> (-5.98%)	⬇️
consumer/offset_store.go	61.32% <0.00%> (-3.82%)	⬇️
consumer/pull_consumer.go	0.00% <0.00%> (ø)
consumer/push_consumer.go	12.47% <0.00%> (-0.09%)	⬇️
internal/client.go	0.16% <0.00%> (-0.01%)	⬇️
internal/model.go	46.22% <0.00%> (-7.04%)	⬇️
internal/request.go	1.53% <0.00%> (-0.09%)	⬇️

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[guyinyou]

LGTM

[maixiaohai]

hi @NeonToo the code is ok, could you link an related issue

[NeonToo]

related #1045