Add PMD suppressions for stylistic rules and generated code (#198)

* Initial plan

* Add pmd-suppressions.xml to repository root

Co-authored-by: carstenartur <3164220+carstenartur@users.noreply.github.com>

* Add complete PMD suppression rules for stylistic patterns and generated code

Co-authored-by: carstenartur <3164220+carstenartur@users.noreply.github.com>

* Fix formatting in pmd-suppressions.xml

Co-authored-by: carstenartur <3164220+carstenartur@users.noreply.github.com>

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Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: carstenartur <3164220+carstenartur@users.noreply.github.com>
Co-authored-by: Carsten Hammer <carsten.hammer@t-online.de>

Author: Copilot