test: add fileopenpicker gallery sample

src/SamplesApp/UITests.Shared/Windows_Storage/Pickers/FileOpenPickerGalleryTests.xaml

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+<Page
+    x:Class="UITests.Shared.Windows_Storage.Pickers.FileOpenPickerGalleryTests"
+    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+    xmlns:storage="using:Windows.Storage"
+	xmlns:wasm="http://uno.ui/wasm"
+    Background="{ThemeResource ApplicationPageBackgroundThemeBrush}"
+    mc:Ignorable="d wasm">
+	<StackPanel Spacing="8">
+		<Button Content="Select single image" Click="PickSingleFileButton_Click"/>
+		<Button Content="Select multiple images" Click="PickMultipleFilesButton_Click"/>
+		
+		<TextBlock x:Name="PickingStatus"/>
+
+		<ListView x:Name="SelectedFilesListView"
+				  Orientation="Horizontal"
+				  ItemsSource="{x:Bind SelectedFiles}"
+				  SelectionMode="None">
+			<ListView.ItemTemplate>
+				<DataTemplate x:DataType="storage:StorageFile">
+					<Image Source="{Binding}" Width="100" Height="100"/>
+					<TextBlock Text="{x:Bind Name}"/>
+				</DataTemplate>
+			</ListView.ItemTemplate>
+	</StackPanel>
+</Page>

src/SamplesApp/UITests.Shared/Windows_Storage/Pickers/FileOpenPickerGalleryTests.xaml.cs

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+using System;
+using System.Collections.ObjectModel;
+using System.Linq;
+using Uno;
+using Uno.Disposables;
+using Uno.Extensions;
+using Uno.UI.Samples.Controls;
+using Uno.UI.Samples.UITests.Helpers;
+using Windows.Storage;
+using Windows.Storage.Pickers;
+using Windows.UI.Core;
+using Microsoft.UI.Xaml.Controls;
+
+namespace UITests.Shared.Windows_Storage.Pickers;
+
+[Sample("Windows.Storage",
+		ViewModelType = typeof(FileOpenPickerTestsViewModel),
+		IsManualTest = true,
+		Description = "")]
+public sealed partial class FileOpenPickerGalleryTests : Page
+{
+	public FileOpenPickerGalleryTests()
+	{
+		this.InitializeComponent();		
+	}
+
+	private async void PickSingleFileButton_Click(object sender, RoutedEventArgs e)
+	{
+		FileOpenPicker picker = new()
+		{
+			picker.SuggestedStartLocation = PickerLocationId.PicturesLibrary;
+		};
+		
+		picker.FileTypeFilter.Add(".jpg");
+		picker.FileTypeFilter.Add(".jpeg");
+		picker.FileTypeFilter.Add(".png");
+		picker.FileTypeFilter.Add(".bmp");
+
+		var storageFile = await picker.PickSingleFileAsync();
+
+		if(storageFile is null)			
+		{
+			return;
+		}
+
+		using var bitmap = new BitmapImage();
+		using var stream = await storageFile.OpenStreamForReadAsync()
+
+		await bitmap.SetSourceAsync(stream);
+		stack.Children.Add(new Image() { Width=200, Height=200, Source = bitmap });
+
+		Status.Text = "Picked 1 image";
+
+		// Display file information
+		Status.Text += "\n\n Info: \n";
+		Status.Text += $"Name: {storageFile.Name} \n";
+		Status.Text += $"Path: {storageFile.Path} \n";			
+	}
+
+	private async void PickMultipleFilesButton_Click(object sender, RoutedEventArgs e)
+	{
+		FileOpenPicker picker = new()
+		{
+			picker.SuggestedStartLocation = PickerLocationId.PicturesLibrary;
+		};
+		
+		picker.FileTypeFilter.Add(".jpg");
+		picker.FileTypeFilter.Add(".jpeg");
+		picker.FileTypeFilter.Add(".png");
+		picker.FileTypeFilter.Add(".bmp");
+
+		var storageFile = await picker.PickMultipleFilesAsync();
+	}		
+}
+
+
+public class FileOpenPickerTestsViewModel : ViewModelBase
+{
+	public ObservableCollection<CarouselItem> Items { get; } = new ObservableCollection<CarouselItem>();
+}
+
+public record CarouselItem(Image Image, string Details);