finish method

Implementation

@override
Future<FinishResult> finish({required String sessionId}) async {
  final result = await methodChannel.invokeMethod<Map>('finish', {
    ...{'sessionId': sessionId}
  });
  if (result != null) {
    return FinishResult.fromJson(Map<String, dynamic>.from(result));
  } else {
    throw Exception("Could not finish session.");
  }
}