[ISSUE #660] Add namespace in java client

[drpmma]

Which Issue(s) This PR Fixes

Fixes #660

Brief Description

Add namespace in java client

How Did You Test This Change?

[codecov-commenter]

Codecov Report

Attention: 18 lines in your changes are missing coverage. Please review.

Comparison is base (2d3cdf7) 46.69% compared to head (f466ae1) 47.06%.

Files	Patch %	Lines
...mq/client/java/impl/consumer/PushConsumerImpl.java	27.27%	8 Missing ⚠️
...cketmq/client/java/impl/producer/ProducerImpl.java	25.00%	6 Missing ⚠️
.../client/java/impl/producer/PublishingSettings.java	62.50%	3 Missing ⚠️
...tmq/client/java/message/PublishingMessageImpl.java	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #661      +/-   ##
============================================
+ Coverage     46.69%   47.06%   +0.36%     
- Complexity      651      668      +17     
============================================
  Files           207      207              
  Lines         12120    12146      +26     
  Branches       3510     3504       -6     
============================================
+ Hits           5659     5716      +57     
+ Misses         6212     6179      -33     
- Partials        249      251       +2     

Flag	Coverage Δ
java	62.94% <68.96%> (+1.21%)	⬆️

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