[1.0] Implement EJBCLIENT-61 feature request

The commit here adds support (and a testcase) for https://issues.jboss.org/browse/EJBCLIENT-61 which now allows EJB client interceptors to be auto registered with the EJB client context via service loader mechanism. Such interceptors which are auto registered via the service loader mechanism will be added to the end of the client interceptor chain, in the order they are found in the classpath. If the user application wants the interceptors to be somewhere else in the chain, then they can make use of the already available EJB client API(s) to do so.

The service loader will look for META-INF/services/org.jboss.ejb.client.EJBClientInterceptor file for registering these EJB client interceptors.