Need a simple data_set validator script

[drewoldag]

We should implement some tooling that will help give people confidence that their data_set class is doing what it is suppose to do.

Given a users data_set class, plus some small amount of example data and a run time config, the tooling should be able to run a few checks on the dataset class, provide an example of the data that it would return, verify that the expected methods are present, ...

Many of those things could be accomplished by simply running fibad using that data_set class, but this tooling could help facilitate a faster development process by eliminating the complication of developing a model at the same time.

This functionality could also serve as a validation for use with a specific version of fibad. i.e. "the data_set class passes this validation for fibad version <= x.y.z".