BUG: ROCAUC is not supported for Binary Classifications

[czaloom]

valor version checks

• I have confirmed this bug exists on the latest version of valor.

Reproducible Example

See sklearn's handling of single class data being passed to `roc_auc_score`

Issue Description

The lite ROCAUC implementation is intended for multiclass data and should not be used with binary classification datasets.

Expected Behavior

We should raise a warning or not return ROCAUC if an invalid input is passed.