Enable TCK integration with Scala hook

[jeffreylovitz]

As described in the openCypher documentation, by exposing a conformant API we can integrate with and run the TCK more directly than the Cucumber->Behave approach used currently.

This would have a few advantages, including accessing the TCK as a Maven dependency, simpler reporting, and fewer custom steps.

This is in the nice-to-have category - not pressing, but worth keeping in mind!