text: Title: Add method to compute Out-of-bag Data Shapely value
  Body: Add this efficient method for Data Shapely and Data Valuation w arbitrary ML models:
  
  [Data-OOB: Out-of-bag Estimate as a Simple and Efficient Data Value](https://arxiv.org/abs/2304.07718)
  
  Make sure the code runs quickly, but is numerically reproducible/stable too