feat: In-app rating request on iOS

# Conflicts:
#	src/Uno.UWP/Generated/3.0.0.0/Windows.Services.Store/StoreRateAndReviewResult.cs
#	src/Uno.UWP/Generated/3.0.0.0/Windows.Services.Store/StoreRateAndReviewStatus.cs
#	src/Uno.UWP/Services/Store/StoreContext.cs
#	src/Uno.UWP/Services/Store/StoreContext.iOS.cs

src/Uno.UWP/Services/Store/StoreContext.cs

@@ -1,20 +1,34 @@
-using System;
-using System.Collections.Generic;
-using System.ComponentModel;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
-using Windows.Foundation;
+using Windows.Foundation;
 
 namespace Windows.Services.Store
 {
 	public sealed partial class StoreContext
 	{
-		private StoreContext() { }
-
-		public static StoreContext GetDefault()
+		private StoreContext()
 		{
-			return new StoreContext();
 		}
+
+		/// <summary>
+		/// Gets a StoreContext object that can be used to access
+		/// and manage store-related data for the current
+		/// user in the context of the current app.
+		/// </summary>
+		/// <returns>An object that you can use to access and manage
+		/// store-related data for the current user.</returns>
+		public static StoreContext GetDefault() => new StoreContext();
+
+		/// <summary>
+		/// Requests the user to rate and review the app. This method will
+		/// display the UI for the user to select a store rating and add
+		/// an optional store review for the product.
+		/// </summary>
+		/// <returns>Store rate and review result.</returns>
+		/// <remarks>
+		/// On iOS and macOS, it is not possible to know whether the user
+		/// actually rated the app or whether the system allowed the dialog
+		/// to be displayed.
+		/// </remarks>
+		public IAsyncOperation<StoreRateAndReviewResult> RequestRateAndReviewAppAsync() =>
+			AsyncOperation.FromTask(ct => RequestRateAndReviewAppTaskAsync(ct));
 	}
 }

src/Uno.UWP/Services/Store/StoreContext.iOS.cs

@@ -7,6 +7,12 @@
 using Uno.Foundation.Logging;
 
 using Foundation;
+using System.Threading.Tasks;
+using System.Threading;
+using Windows.System;
+using Windows.UI.Core;
+using CoreFoundation;
+using StoreKit;
 
 namespace Windows.Services.Store
 {
@@ -56,5 +62,22 @@ public IAsyncOperation<StoreProductResult> GetStoreProductForCurrentAppAsync()
 
 		[GeneratedRegex("trackId[^0-9]*([0-9]*)")]
 		private static partial Regex TrackParser();
+
+		private async Task<StoreRateAndReviewResult> RequestRateAndReviewAppTaskAsync(CancellationToken cancellationToken)
+		{
+			try
+			{
+				await CoreDispatcher.Main.RunAsync(CoreDispatcherPriority.Normal, (cancellationToken) =>
+				{
+					SKStoreReviewController.RequestReview(UIApplication.SharedApplication.KeyWindow.WindowScene);
+				});
+
+				return new StoreRateAndReviewResult(StoreRateAndReviewStatus.Succeeded);
+			}
+			catch (Exception ex)
+			{
+				return new StoreRateAndReviewResult(StoreRateAndReviewStatus.Error, ex);
+			}
+		}
 	}
 }

src/Uno.UWP/Services/Store/StoreRateAndReviewResult.cs

@@ -0,0 +1,28 @@
+#nullable enable
+
+using System;
+
+namespace Windows.Services.Store
+{
+	/// <summary>
+	/// Provides response data for a request to rate and review the product.
+	/// </summary>
+	public partial class StoreRateAndReviewResult
+	{
+		internal StoreRateAndReviewResult(StoreRateAndReviewStatus status, Exception? extendedError = null)
+		{
+			Status = status;
+			ExtendedError = extendedError;
+		}
+
+		/// <summary>
+		/// Gets the status for the rate and review request for the product.
+		/// </summary>
+		public StoreRateAndReviewStatus Status { get; }
+
+		/// <summary>
+		/// Gets the error code for the request, if the operation encountered an error.
+		/// </summary>
+		public Exception? ExtendedError { get; }
+	}
+}

src/Uno.UWP/Services/Store/StoreRateAndReviewStatus.cs

@@ -0,0 +1,28 @@
+namespace Windows.Services.Store
+{
+	/// <summary>
+	/// Gets the result status for the rate and review request for the product.
+	/// </summary>
+	public enum StoreRateAndReviewStatus
+	{
+		/// <summary>
+		/// The request was successful.
+		/// </summary>
+		Succeeded,
+
+		/// <summary>
+		/// The request was canceled by the user.
+		/// </summary>
+		CanceledByUser,
+
+		/// <summary>
+		/// The request encountered a network error.
+		/// </summary>
+		NetworkError,
+
+		/// <summary>
+		/// The request encountered an error.
+		/// </summary>
+		Error,
+	}
+}