Apply default values to ADaM mappings
Examples
default_apply(adam_mapping(name = "apat"))
#> ADaM mapping:
#> * `name` -> "apat"
#> * `id` -> "USUBJID"
#> * `group` -> NULL
#> * `var` -> NULL
#> * `subset` -> NULL
#> * `label` -> "All Participants as Treated"