Update example to flush OnStop

[snakefoot]

Update the example code to force flush on OnStop:

• https://learn.microsoft.com/en-us/dotnet/maui/fundamentals/app-lifecycle?view=net-maui-9.0

using Microsoft.Maui.LifecycleEvents;

namespace PlatformLifecycleDemo
{
    public static class MauiProgram
    {
        public static MauiApp CreateMauiApp()
        {
            var builder = MauiApp.CreateBuilder();
            builder
                .UseMauiApp<App>()
                .ConfigureLifecycleEvents(events =>
                {
#if IOS || MACCATALYST
                    events.AddiOS(ios => ios
                        .OnActivated((app) => LogEvent(nameof(iOSLifecycle.OnActivated)))
                        .OnResignActivation((app) => LogEvent(nameof(iOSLifecycle.OnResignActivation)))
                        .DidEnterBackground((app) => LogEvent(nameof(iOSLifecycle.DidEnterBackground)))
                        .WillTerminate((app) => LogEvent(nameof(iOSLifecycle.WillTerminate))));
#endif
                    static bool LogEvent(string eventName, string type = null)
                    {
                        NLog.LogManager.Info($"Lifecycle event: {eventName}{(type == null ? string.Empty : $" ({type})")}");
                        NLog.LogManager.Flush();
                        return true;
                    }
                });

            return builder.Build();
        }
    }
}

Mostly important if depending on async-wrapper or network-targets (eMail / Syslog / Graylog / Database etc.)

If just using pure console-target and file-target without any wrappers, then everything is synchronous and no bonus flush needed.

Event	Android	iOS	Windows
Created	OnPostCreate	FinishedLaunching	Created
Activated	OnResume	OnActivated	Activated (CodeActivated and PointerActivated)
Deactivated	OnPause	OnResignActivation	Activated (Deactivated)
Stopped	OnStop	DidEnterBackground	VisibilityChanged
Resumed	OnRestart	WillEnterForeground	Resumed
Destroying	OnDestroy	WillTerminate	Closed