Given a dataset ID generated from get_dataset_id(), runs dx extract_dataset
with the --list-fields option.
find_fields(dataset_id = NULL)ID of the dataset, in project-XXXX:record-YYYY format
data.frame of all field IDs associated with the dataset
if (FALSE) {
ds_id <- get_dataset_id()
field_frame <- list_fields(ds_id)
}