Add Simulation Support for "Don’t Waste Your Time: Early Stopping Cross-Validation"

[Nick Erickson]

Add support for simulating the approaches proposed in "Don’t Waste Your Time: Early Stopping Cross-Validation"

TODO:

• #59
• Add support for per-fold prediction results fetching on val/test
• Add fit time / infer time support for per-fold
• Add test time predictions for per-fold results (Note: Requires rerun of all configs)