[FEA] Implement `adjusted_mutual_info_score`

It would be great if [`adjusted_mutual_info_score`](https://scikit-learn.org/stable/modules/generated/sklearn.metrics.adjusted_mutual_info_score.html) were made available in `cuml`, esp. since there is [some evidence](https://www.jmlr.org/papers/v17/15-627.html) that it is preferable to the ARI in the presence of unbalanced cluster sizes, and is slower to calculate.
