existsID method
Implementation
@override
FutureOr<bool> existsID(dynamic id, {Transaction? transaction}) {
var cachedEntityByID = transaction?.getCachedEntityByID(id, type: type);
if (cachedEntityByID != null) return false;
return count(matcher: ConditionID(id), transaction: transaction)
.resolveMapped((count) => count > 0);
}