Update the module hierarchy for the parser example

[totalo]

For #12366.

Changes proposed in this pull request:

• Update the module hierarchy for the parser example

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Before committing this PR, I'm sure that I have checked the following options:

• My code follows the code of conduct of this project.
• I have self-reviewed the commit code.
• I have (or in comment I request) added corresponding labels for the pull request.
• I have passed maven check locally : ./mvnw clean install -B -T1C -Dmaven.javadoc.skip -Dmaven.jacoco.skip -e.
• I have made corresponding changes to the documentation.
• I have added corresponding unit tests for my changes.

[codecov-commenter]

Codecov Report

Merging #23156 (ad06119) into master (bbae7b7) will increase coverage by 0.11%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master   #23156      +/-   ##
============================================
+ Coverage     49.87%   49.98%   +0.11%     
+ Complexity     2439     2437       -2     
============================================
  Files          4111     4114       +3     
  Lines         57587    57616      +29     
  Branches       9098     9099       +1     
============================================
+ Hits          28719    28797      +78     
+ Misses        26343    26287      -56     
- Partials       2525     2532       +7     

Impacted Files	Coverage Δ
...handler/distsql/ral/hint/enums/HintSourceType.java	0.00% <0.00%> (-42.86%)	⬇️
.../CreateReadwriteSplittingRuleStatementUpdater.java	68.75% <0.00%> (-1.25%)	⬇️
...ingsphere/agent/bootstrap/ShardingSphereAgent.java	0.00% <0.00%> (ø)
...encrypt/algorithm/encrypt/MD5EncryptAlgorithm.java	100.00% <0.00%> (ø)
...yaml/swapper/YamlMaskRuleConfigurationSwapper.java	95.65% <0.00%> (ø)
...trap/plugin/loader/AdvisorConfigurationLoader.java	0.00% <0.00%> (ø)
...trap/transformer/builder/advise/AdviceFactory.java	83.33% <0.00%> (ø)
...ore/ReadwriteSplittingDistSQLStatementVisitor.java	0.00% <0.00%> (ø)
...cket/command/query/MySQLColumnFieldDetailFlag.java
...lgorithm/cover/MaskBeforeSpecialCharAlgorithm.java
... and 23 more

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