add benchmarks from value notifier vs get value

+import 'dart:async';
+
+import 'package:flutter/foundation.dart';
+import 'package:get/state_manager.dart';
+
+int times = 3;
+int get last => times - 1;
+
+Future<String> valueNotifier() {
+  final c = Completer<String>();
+  final value = ValueNotifier<int>(0);
+  final timer = Stopwatch();
+  timer.start();
+
+  value.addListener(() {
+    if (last == value.value) {
+      timer.stop();
+      c.complete("""${value.value} item value notifier 
+objs time: ${timer.elapsedMicroseconds}ms""");
+    }
+  });
+
+  for (var i = 0; i < times; i++) {
+    value.value = i;
+  }
+
+  return c.future;
+}
+
+Future<String> getValue() {
+  final c = Completer<String>();
+  final value = Value<int>(0);
+  final timer = Stopwatch();
+  timer.start();
+
+  value.addListener(() {
+    if (last == value.value) {
+      timer.stop();
+      c.complete("""${value.value} item get value objs 
+  time: ${timer.elapsedMicroseconds}ms""");
+    }
+  });
+
+  for (var i = 0; i < times; i++) {
+    value.value = i;
+  }
+
+  return c.future;
+}
+
+Future<String> getStream() {
+  final c = Completer<String>();
+
+  final value = StreamController<int>();
+  final timer = Stopwatch();
+  timer.start();
+
+  value.stream.listen((v) {
+    if (last == v) {
+      timer.stop();
+      c.complete("$v item stream objs time: ${timer.elapsedMicroseconds}ms");
+    }
+  });
+
+  for (var i = 0; i < times; i++) {
+    value.add(i);
+  }
+
+  return c.future;
+}
+
+void main() async {
+  print(await getValue());
+  print(await valueNotifier());
+  print(await getStream());
+  times = 30000;
+  print(await getValue());
+  print(await valueNotifier());
+  print(await getStream());
+}
+
+typedef VoidCallback = void Function();