load External Incident Ids
fun loadExternalIncidentIds(links: List<IncidentLink>, listener: (List<ByteArray>) -> Unit, errorListener: (IncidentsManager.ErrorCode) -> Unit, executor: Executor? = null)
fun loadExternalIncidentIds(links: List<IncidentLink>, listener: IncidentsManager.IncidentExternalIdsListener, executor: Executor? = null)