[ISSUE #70]Add retained message

[YYYYWD]

close #70
Implement retained messages via kv store

[YYYYWD]

#70

[DongyuanPan]

please fix travis ci

[codecov-commenter]

Codecov Report

Merging #118 (b9ff16a) into main (0d8ecf3) will decrease coverage by 0.92%.
The diff coverage is 32.87%.

@@            Coverage Diff             @@
##             main     #118      +/-   ##
==========================================
- Coverage   45.01%   44.09%   -0.93%     
==========================================
  Files         107      109       +2     
  Lines        4567     4887     +320     
  Branches      676      726      +50     
==========================================
+ Hits         2056     2155      +99     
- Misses       2157     2371     +214     
- Partials      354      361       +7     

Impacted Files	Coverage Δ
...g/apache/rocketmq/mqtt/common/model/Constants.java	0.00% <ø> (ø)
...rg/apache/rocketmq/mqtt/cs/session/QueueFresh.java	90.00% <ø> (ø)
...ketmq/mqtt/ds/meta/RetainedPersistManagerImpl.java	3.33% <3.33%> (ø)
...cs/protocol/mqtt/handler/MqttSubscribeHandler.java	42.70% <4.08%> (-40.97%)	⬇️
...e/rocketmq/mqtt/ds/store/LmqQueueStoreManager.java	51.85% <41.17%> (+0.68%)	⬆️
...q/mqtt/ds/upstream/processor/PublishProcessor.java	66.66% <47.36%> (-33.34%)	⬇️
...che/rocketmq/mqtt/cs/session/infly/PushAction.java	57.57% <57.14%> (-0.32%)	⬇️
...va/org/apache/rocketmq/mqtt/common/model/Trie.java	81.62% <73.91%> (-4.71%)	⬇️
...org/apache/rocketmq/mqtt/common/model/Message.java	74.46% <88.88%> (+1.21%)	⬆️
...org/apache/rocketmq/mqtt/common/util/TrieUtil.java	93.75% <93.75%> (ø)
... and 2 more

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[pingww]

add some unit tests

[DongyuanPan]

The KV will be removed and the code can be submitted to the Develop branch based on the state machine

[ShannonDing]

close due to #131.