Can the methods in causalml be trained with incremental training?

[evelynjin990]

Is your feature request related to a problem? Please describe.
Using large dataset to train uplift models like dr_learner or causalforest is quite slow and often we need to add some new data into it to retrain the model, so I think incremental training might be helpful.

Describe the solution you'd like
I hope this package could supply a method to use incremental training.

Describe alternatives you've considered
Not yet.

Additional context
Add any other context or screenshots about the feature request here.