[FEATURE]: Add a drop_labels() function for removing labels from labelled supertibbles

[rsh52]

Feature Request Description

Some functions, like skimr::skim() don't work well with labelled data sets. We should give users the option to remove labels after the fact for operations that may already be using their extracted supertibble. tidyREDCap::drop_labels() does a similar thing.

Checklist

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[larmarange]

You could use labelled::remove_var_label() cf. https://larmarange.github.io/labelled/reference/remove_labels.html

A general comment: instead of referring to "labels", it would be better to distinct "variable labels" and "value labels" in the documentation.