ProcessAnnotatedType - clarify what happens if both setAnnotatedType() and configurator are used within observer notification

Right now, it's not clear what happens if:

• a user first calls setAnnotatedType() and then obtains a reference to the configurator (note that the configurator should be initialized with the AT being processed)
• a user obtains a reference to a configurator and then invokes setAnnotatedType()

We could either forbid using both of these methods during one notification, or state that the "last one wins". I would rather go the first way as the second solution might be confusing and error-prone.

This applies to ProcessObserverMethod, ProcessBeanAttributes and ProcessInjectionPoint as well.