Should split API and Impl in two different modules

ContextAppenders are auto included in the runtime if found on ClassPath.

We should consider splitting the performance extension into two modules, api and impl. Where API contains all the user facing annotations etc. With this you can compile against API and only include impl when you actually want to run the test case in performance 'mode', e.g. via a special profile.

mvn test -P jbossas-remote-6,performance-test