[Feature Request]: Implement Policy Learning based on APO Model

[SvenKlaassen]

Describe the feature you want to propose or implement

Implement a general policy learning method based on multiple possible treatments.

Propose a possible solution or implementation

Based on Policy Learning with Confidence.
Using the APOs and several possible weighted options (and e.g. tree search) one could implement the proposed algorithms as the solely rely on value estimates and standard errors.