Exported classpath entries of dependent modules are not considered

To populate properties `sonar.java.libraries` and `sonar.java.test.libraries` we are collecting classpath entries of the current module.
We totally miss the fact that a module can depend on other modules (transitively) and each module can decide to export some of its classpath entries.

This means we can easily analyze Java files with a truncated classpath, leading to FP/FN.

See the attached reproducer: