check data type for the model mode

[topepo]

Test to see if integers work for classification, etc.

Should this be another module?

[topepo]

translate happens in fit and fit_xy before passing the object to the data handling functions.

parsnip:::levels_from_formula is called just before the model evaluation code to get the levels of the outcome (if any, and it doesn't currently work for spark). If we can postpone translate until after this, we could set the model mode.

[github-actions]

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