Add support for accessing the invoker proxy container state

Support for the following IClientContainer interface contract should exist in the detached invoker proxies:

public interface IClientContainer
{
/**

• Access a copy of the proxy container interceptor stack.
• @return ArrayList<org.jboss.proxy.Interceptor>
  */
  public ArrayList getInterceptors();
  /**
• Set the proxy container interceptor stack.
• @param interceptors - ArrayList<org.jboss.proxy.Interceptor> to
• install as the new interceptor stack
  */
  public void setInterceptors(ArrayList interceptors);
  /**
• Access the InvocationContext associated with the proxy by the
• server side proxy factory. The contents of this will depend on
• the proxy factory.
• @return The proxy creation time InvocationContext
  */
  public InvocationContext getInvocationContext();
  }

This allows clients of the proxies to manipulate the proxy state in a more dynamic manner.