Add functional_data to ScanResult

Author: robert-ancell

packages/reactive_ble_platform_interface/lib/src/model/discovered_device.dart

@@ -14,7 +14,8 @@ part 'discovered_device.g.dart';
 
 /// Result of a scan interval.
 @immutable
-class ScanResult {
+@FunctionalData()
+class ScanResult extends $ScanResult {
   final Result<DiscoveredDevice, GenericFailure<ScanFailure>?> result;
   const ScanResult({required this.result});