Explode a register table's `Person` list column into one row per record
Source:R/utils_work_person_keys.R
explode_person_records.RdTurns each certificate's list of `orcid, name, role` records (see [add_person_records()]) into its own row, replacing the `Person` list column with a plain `Person` character column (the ORCID, matching `CONFIG$FILTER_COLUMN_NAMES[["persons"]]`, so the caller can `group_by()` it directly) plus a `Role` column ("author"/"codechecker"). A certificate with no ORCID-identified person at all contributes no rows.