[RegistryPreview] Adopt Monaco Editor (#35122)

src/modules/registrypreview/RegistryPreviewUILib/RegistryPreviewMainPage.xaml

@@ -3,6 +3,7 @@
     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:local="using:RegistryPreviewUILib"
     xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
     xmlns:tk7controls="using:CommunityToolkit.WinUI.UI.Controls"
     xmlns:tkcontrols="using:CommunityToolkit.WinUI.Controls"
@@ -133,28 +134,12 @@
             </CommandBar>
         </Border>
 
-        <TextBox
-            x:Name="textBox"
-            x:Uid="textBox"
+        <local:MonacoEditorControl
+            x:Name="MonacoEditor"
             Grid.Row="1"
             Grid.RowSpan="3"
             Grid.Column="0"
-            HorizontalAlignment="Stretch"
-            VerticalAlignment="Stretch"
-            AcceptsReturn="True"
-            CanBeScrollAnchor="False"
-            CornerRadius="{StaticResource OverlayCornerRadius}"
-            FontFamily="Cascadia Mono, Consolas, Courier New"
-            IsSpellCheckEnabled="False"
-            IsTabStop="True"
-            IsTextPredictionEnabled="False"
-            PlaceholderText="{Binding PlaceholderText}"
-            ScrollViewer.HorizontalScrollBarVisibility="Visible"
-            ScrollViewer.IsHorizontalRailEnabled="True"
-            ScrollViewer.IsVerticalRailEnabled="True"
-            ScrollViewer.VerticalScrollBarVisibility="Visible"
-            TabIndex="0"
-            TextWrapping="NoWrap" />
+            IsTabStop="True" />
 
         <Border
             Grid.Row="1"