seed method
Implementation
Future<bool> seed({required List<Flag> items}) async {
var list = items
.map((e) => MapEntry(e.key, _storageSecurity.encrypt(e.asString())))
.toList();
var result = await _storage.seed(list);
if (result) {
for (var item in items) {
_createSubject(item);
}
}
return result;
}