v2: Upload models to WandB

[alejandromarcu]

Now in the yaml we can define when to uploal models in 2 ways:

1. At regular intervals (every X models or amount of time)
2. When some of the metrics reach an all time min or max.

E.g.:

  upload_model:
    every: 100 models
    when_max:
      - raw_win_perc
      - p2_win_perc
    when_min:
      - dumb_score

[adamantivm]

LGTM