feat(steps): implement a step to count encode cols #31
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Required for https://nvidia-merlin.github.io/NVTabular/v1.0.0/examples/winning-solution-recsys2020-twitter/01-02-04-Download-Convert-ETL-with-NVTabular-Training-with-XGBoost.html.
Based on https://github.com/rapidsai/deeplearning/blob/main/RecSys2020Tutorial/03_4_CountEncoding.ipynb.
I don't treat nulls as a meaningful unknown value; to get counts for nulls, add a step like
FillNA("UNKNOWN")first.