In `tagColumns` specify `hidden` instead of `features`

[lars-reimann]

Is your feature request related to a problem?

tagColumn allows some columns to be hidden during training and prediction. This is very helpful to connect predictions to some IDs. However, currently a long list of all features must be specified to exclude a few columns.

Desired solution

Instead, specify target and hidden. Everything that remains is used as a feature.

Possible alternatives (optional)

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Screenshots (optional)

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Additional Context (optional)

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[lars-reimann]

Another name for hidden would be excluded_from_training.