[#35] Use LitePullConsumer model instead of default pull consumer

[yiduwangkai]

close #35
Use DefaultLitePullConsumer model instead of default pull consumer.

Tips
Thank you very much for contributing to Apache rocketmq-flink.
What is the purpose of the pull request
*solve some code about using defaultPullConsumer api

Brief change log
(for example:)

*Modify
RocketMQConfig.java
RocketMQSourceFunction.java
RocketMQSourceEnumerator.java
RocketMQPartitionSplitReader.java
RocketMQSourceTest.java

[yiduwangkai]

there are some problems about this code, like home to Use defaultlitPullConsumer to get offset and perform offset self-management

[SteNicholas]

Thanks for @yiduwangkai contribution. I have left the comments for this pull request. Did you test the changes? In addtion, please resolve the conflicts.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 5.15464% with 92 lines in your changes missing coverage. Please review.

Project coverage is 28.62%. Comparing base (90b00be) to head (3f5fbe4).
Report is 12 commits behind head on main.

Files with missing lines	Patch %	Lines
.../rocketmq/flink/legacy/RocketMQSourceFunction.java	0.00%	57 Missing ⚠️
...nk/source/reader/RocketMQPartitionSplitReader.java	0.00%	25 Missing ⚠️
...nk/source/enumerator/RocketMQSourceEnumerator.java	0.00%	9 Missing ⚠️
...g/apache/rocketmq/flink/source/RocketMQSource.java	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main      #46      +/-   ##
============================================
+ Coverage     28.50%   28.62%   +0.11%     
  Complexity      164      164              
============================================
  Files            62       62              
  Lines          2529     2536       +7     
  Branches        269      269              
============================================
+ Hits            721      726       +5     
- Misses         1741     1743       +2     
  Partials         67       67              

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[SteNicholas]

Thanks for @yiduwangkai updates. Could you please resolve the conflicts and squash the commits?

[SteNicholas]

Thanks for @yiduwangkai updates. I left some comments for this update. PTAL.

[zhouxinyu]

Thanks, @yiduwangkai for your contributions. I left some comments, but I'm not familiar with rocketmq-flink, so please @SteNicholas help have a look.

[zhouxinyu]

Since not all broker versions support lite pull, we need to clarify it in our doc.

[SteNicholas]

LGTM.