Implement the [Package-Rule](https://github.com/devonfw/sonar-devon4j-plugin/blob/master/documentation/rules.asciidoc#package-rules) with ArchUnit. Acceptance-Criteria: * [ ] Rule P1 is implemented with ArchUnit, but adapted for [modern devonfw Java package structure](https://github.com/devonfw/java/blob/main/modules/ROOT/pages/architecture/layered_architecture.adoc#package-structure).
Implement the Package-Rule with ArchUnit.
Acceptance-Criteria: