tomee embedded single instance runner

see org.apache.tomee.embedded.SingleInstanceRunnerTest for a sample.
idea is to reuse some part of ApplicationComposer API to get a single container for all tests in embedded mode.

Base is to declare an @Application class which holds the model and some injections.

Note: this can be replaced setting tomee.application-composer.application property to the fully qualified name of the app.
Note: @Application classes are only searched in the same jar as the test.

Model:

• @Classes: only context value is used.
• @ContainerProperties: to configure the container
• @WebResource: first value can be used to set the docBase (other values are ignored)
• @TomEEEmbeddedSingleRunner.LifecycleTasks: allow to add some lifecycle tasks (like starting a ftp/sft/elasticsearch... server)

Injections:

• CDI
• @RandomPort: with the value http or https. Supported types are URL (context base) and int (the port).