[ISSUE #3914] Support multi dirs storage in DLedger

[cserwen]

Make sure set the target branch to develop

What is the purpose of the change

Fix #3914

Brief changelog

XX

Verifying this change

XXXX

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[codecov-commenter]

Codecov Report

Merging #4122 (8d704bd) into develop (e7c87fa) will increase coverage by 0.06%.
The diff coverage is 100.00%.

@@              Coverage Diff              @@
##             develop    #4122      +/-   ##
=============================================
+ Coverage      47.92%   47.98%   +0.06%     
- Complexity      4999     5010      +11     
=============================================
  Files            634      635       +1     
  Lines          42529    42514      -15     
  Branches        5573     5567       -6     
=============================================
+ Hits           20380    20401      +21     
+ Misses         19651    19624      -27     
+ Partials        2498     2489       -9     

Impacted Files	Coverage Δ
...ache/rocketmq/store/config/MessageStoreConfig.java	61.72% <100.00%> (+0.47%)	⬆️
...pache/rocketmq/store/dledger/DLedgerCommitLog.java	76.17% <100.00%> (+0.19%)	⬆️
...ketmq/common/protocol/body/ConsumerConnection.java	95.83% <0.00%> (-4.17%)	⬇️
...lient/impl/consumer/DefaultMQPushConsumerImpl.java	41.05% <0.00%> (-2.99%)	⬇️
...a/org/apache/rocketmq/filter/util/BloomFilter.java	60.43% <0.00%> (-2.20%)	⬇️
...org/apache/rocketmq/common/stats/StatsItemSet.java	50.74% <0.00%> (-1.50%)	⬇️
...ocketmq/client/consumer/DefaultMQPushConsumer.java	57.92% <0.00%> (-0.50%)	⬇️
...pl/consumer/ConsumeMessageConcurrentlyService.java	47.88% <0.00%> (-0.47%)	⬇️
...nt/impl/consumer/ConsumeMessageOrderlyService.java	49.64% <0.00%> (-0.36%)	⬇️
...rocketmq/client/impl/factory/MQClientInstance.java	50.83% <0.00%> (-0.31%)	⬇️
... and 16 more

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[coveralls]

Coverage increased (+0.1%) to 51.887% when pulling 0c23af7 on cserwen:multi_dir into 8745d4c on apache:develop.

[coveralls]

Coverage decreased (-0.1%) to 51.839% when pulling 8d704bd on cserwen:multi_dir into ead6274 on apache:develop.

[cserwen]

@RongtongJin @Jason918 Hello, can you help me to review this pr?

[cserwen]

@RongtongJin ping~

[cserwen]

@Jason918 ping

[Jason918]

Overall LGTM. Left some minor question.