Avoid split packages

[jpraet]

When running with Quarkus, the following warning is emitted:

[WARNING] [io.quarkus.arc.deployment.SplitPackageProcessor] Detected a split package usage which is considered a bad practice and should be avoided. Following packages were detected in multiple archives:
- "io.github.belgif.rest.problem" found in [io.github.belgif.rest.problem:belgif-rest-problem-it-common:jakarta:latest, io.github.belgif.rest.problem:belgif-rest-problem-quarkus:latest, io.github.belgif.rest.problem:belgif-rest-problem:latest]
- "io.github.belgif.rest.problem.registry" found in [io.github.belgif.rest.problem:belgif-rest-problem-it-common:jakarta:latest, io.github.belgif.rest.problem:belgif-rest-problem:latest]
- "io.github.belgif.rest.problem.internal" found in [io.github.belgif.rest.problem:belgif-rest-problem-quarkus:latest, io.github.belgif.rest.problem:belgif-rest-problem:latest]