Add comparables finding output to res and condo models 04-interpret step

[dfsnow]

We established an experimental sale comp finding methodology in ccao-data/lightsnip@5b00f48 which uses the tree structure of LightGBM/XGBoost models to find similar properties from training data. We should integrate this method into the 04-interpret stage and output it to Athena in a new model.comp table.

Note that we should probably resolve ccao-data/lightsnip#7 first.