Handle redcap labels

[alnajar]

The current package handles variable labels using the drop_label() function, similar to raw_or_label_headers in REDCapR. However, it can be further enhanced to handle value labels as well.

For instance, the REDCapR package offers the option to obtain raw data using API requests:

REDCapR::redcap_read_oneshot(redcap_uri="https://redcap.miami.edu/api/", 
                                   token=keyring::key_get("RED_API_KEY"),
                                   raw_or_label = "raw"      #raw option specifies to export the raw coded values rather than labels in multiple choice fields
)$data

To improve the package, I suggest incorporating the expss package functions, which allows handling data without removing labels. This enhancement will enable users to explore the value labels without needing to refer back to the "code dictionary" in Redcap. The expss::val_lab() function can be utilized for this purpose.