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

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)