Per application Expressions driven by the management model

This is the core side part of WFLY-8868. The overall request involves being able to include a properties attribute as part of a management model deployment resource, with those properties then being available to expression resolution, the same way env vars, system props, vault values and META-INF/jboss-properties values are. The core side aspect of this is to maintain the props in the model and make those values available to the DeploymentUnitProcessors. The WildFly full side part is to enhance the existing ee subsystem DUPs that deal with expression resolution to have them take advantage of this new source of resolution data.

This basically is an improvement on the existing META-INF/jboss-properties facility by allowing the admin to control the resolution without having to mess with the deployment content.