allow implementations to optionally specify test data ids

[saupchurch]

Implementations may have specific ID formats that must be validated. To support this we should re-introduce ID fields to the testing yaml file for these cases. Unless specified in the yaml the current IDs for the test data set can be used as default values.

[saupchurch]

There is now a driver project requesting this feature. For independent testing, there should be a way for an implementor to specify the test dataset to use and provide the proper responses. This removes the current dependency on loading the test dataset just to run the tests only to have to remove it once the tests are run.