Feature request: country subdivisions #85
Description
opening-hours-rs currently assumes that all public holidays listed by date.nager.at are nationwide, even when global=false and counties != null. Example: https://date.nager.at/api/v3/PublicHolidays/2025/DE
If you want to avoid building in full subdivision support, it could be useful to return RuleKind::Unknown for non-nationwide holidays.
Thanks for building opening-hours-rs!