1bd9848d42
This commit adds a new custom build Plugin, the `ArchitecturePlugin`. This plugin is using ArchUnit to enforce several rules in the main sources of the project: * All "package-info" should be `@NullMarked` * Classes should not import forbidden types (like "reactor.core.support.Assert" * Java Classes should not import "org.jetbrains.annotations.*" annotations * Classes should not call "toLowerCase"/"toUpperCase" without a Locale * There should not be any package tangle Duplicate rules were removed from checkstyle as a result. Note, these checks only consider the "main" source sets, so test fixtures and tests are not considered. Repackaged sources like JavaPoet, CGLib and ASM are also excluded from the analysis. Closes gh-34276
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