[AutoML] feature request Include PFI statistics

Users of AutoML would probably appreciate having templating injected PFI for the "best" model as described in the online [documentation](https://docs.microsoft.com/en-us/dotnet/machine-learning/how-to-guides/explain-machine-learning-model-permutation-feature-importance-ml-net)

I guess one could add it after the training dialogue as well. Nice for those that like to spin the data. perhaps start training again after the user excludes some of the "noisy features"