getRegions method
The function getRegions returns a Future that resolves to a list of Region objects, or null, and
takes an optional regionId parameter.
@param {String} regionId - The regionId parameter is an optional String that represents the ID
of a specific region.
Implementation
Future<List<Region>?> getRegions([String? regionId]) {
throw UnimplementedError('setPoiRadius() has not been implemented.');
}