chore: add security ruleset to PMD

[vil02]

This PR adds the security rulse set to the current PMD config. There are more exiting rule sets like:

• bestpractices.xml,
• codestyle.xml,
• design.xml,
• documentation.xml,
• errorprone.xml,
• multithreading.xml,
• performance.xml,

but they require suppressing MANY warnings in our case. This rule set can be added for free.

Continuation of #5155.

• I have read CONTRIBUTING.md.
• This pull request is all my own work -- I have not plagiarized it.
• All filenames are in PascalCase.
• All functions and variable names follow Java naming conventions.
• All new algorithms have a URL in their comments that points to Wikipedia or other similar explanations.
• All new code is formatted with clang-format -i --style=file path/to/your/file.java

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Please upload report for BASE (master@b427b40). Learn more about missing BASE report.

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #6292   +/-   ##
=========================================
  Coverage          ?   74.09%           
  Complexity        ?     5345           
=========================================
  Files             ?      677           
  Lines             ?    18639           
  Branches          ?     3618           
=========================================
  Hits              ?    13810           
  Misses            ?     4273           
  Partials          ?      556           

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[DenizAltunkapan]

looks good!