Standard way to get "feature name" from Interpretation classes

At the moment, it is not necessarily obvious how to get the well name that is associated with a WellboreInterpretation object. It could be handy to have a method that gets the `feature_name`, for example by looking up the `title` attribute of the associated feature object.

One option could be to implement this with a "Mixin class" for Interpretation classes, that adds standard attributes and methods for handling the related Feature objects.