DRTester does not have support for sample_weight

[gdaiha]

I work with summarized data to make causal inference, where each row corresponds to a group of units. When I try to use DRTester to validate results, the methods inside the class (fit_nuisance, fit_nuisance_cv, fit_nuisance_train, evaluate_cal...) do not have support for sample_weight. I use it to represent the original distribution. It would be nice to have this support.