Introduce using MicroProfile Config API #7457
Description
This is a story for epic #7000
This could be done as part of #7424, but as we prefer more narrow scopes, don't.
As you might have noticed, #7422 is about to introduce the first pieces to bring us the joy of MicroProfile Config API without calling ourselves a microservice.
This issue is about paving the ground to enable #7424 profit from it and offer full configuration flexibility.
We will introduce:
- Maven dependencies for using the API
- A test dependency for running unit and integration tests with an API implementation but without deploying to a full fledged appserver
- Allow moving and renaming of config, but remain backward-compatible:
- A config source to enable aliases, as we are likely to rename a few "JVM properties"
- A config source to allow moving some database settings to MicroProfile Config
- Scenario: make the old settings deprecated and log their use, giving hints about migration