Refactor the packages structure of the operator

Add GPG signing to boms

Add javadoc artefacts to spring bundles (keycloak#10261)

Closes keycloak#10260

Set version to 17.0.0

Set version to 16.1.1

Set version to 16.1.0

Update files

Set version to 15.1.1

Update files

Set version to 15.0.2