Tooling to inspect a rule session. The two major methods here are:

* inspect, which returns a data structure describing the session that can be used by tooling.
* explain-activations, which uses inspect and prints a human-readable description covering
why each rule activation or query match occurred.

Internal implementation details of session inspection.  Nothing in this namespace
should be directly referenced by callers outside of the clara-rules project.

Internal utilities for testing clara-rules and derivative projects.  These should be considered experimental
right now from the perspective of consumers of clara-rules, although it is possible that this namespace 
will be made part of the public API once its functionality has proven robust and reliable.  The focus, however,
is functionality needed to test the rules engine itself.

Support for tracing state changes in a Clara session.