Add helper classes to make sure applications are set-up correctly

[smoyer64]

Add a Preconditions utility class and a PreconditionViolationException that can test that required properties are present and compliant. Add a collector that can package one or more of these exceptions into a DeploymentException that will stop an application's execution. (As an alternative, see if the Microprofile Config implementation can be shrunk and used in a non-EE environment)