XGBoost - Use DaskDMatrix for evals data to ensure metrics in logs match result of evaluate#682

oliverholworthy merged 10 commits intoNVIDIA-Merlin:mainNVIDIA-Merlin/models:mainfrom

oliverholworthy:xgboost-evals-dmatrixoliverholworthy/models:xgboost-evals-dmatrixCopy head branch name to clipboard