[AOT] Clean up some AOT issues in Advanced Paste module

src/modules/AdvancedPaste/AdvancedPaste/Helpers/NativeMethods.cs

@@ -18,7 +18,7 @@ internal struct INPUT
 
             internal static int Size
             {
-                get { return Marshal.SizeOf(typeof(INPUT)); }
+                get { return Marshal.SizeOf<INPUT>(); }
             }
         }
 

src/modules/AdvancedPaste/AdvancedPaste/Helpers/UserSettings.cs

@@ -16,7 +16,7 @@
 
 namespace AdvancedPaste.Settings
 {
-    internal sealed class UserSettings : IUserSettings, IDisposable
+    internal sealed partial class UserSettings : IUserSettings, IDisposable
     {
         private readonly SettingsUtils _settingsUtils;
         private readonly TaskScheduler _taskScheduler;

src/modules/AdvancedPaste/AdvancedPaste/Models/AdvancedPasteJsonSerializerContext.cs

@@ -0,0 +1,13 @@
+// Copyright (c) Microsoft Corporation
+// The Microsoft Corporation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System.Text.Json.Serialization;
+
+namespace AdvancedPaste.Models
+{
+    [JsonSerializable(typeof(CustomQuery))]
+    internal sealed partial class AdvancedPasteJsonSerializerContext : JsonSerializerContext
+    {
+    }
+}

src/modules/AdvancedPaste/AdvancedPaste/Models/CustomQuery.cs

@@ -17,10 +17,10 @@ internal sealed class CustomQuery : ISettingsConfig
 
         public string GetModuleName() => Constants.AdvancedPasteModuleName;
 
-        public string ToJsonString() => JsonSerializer.Serialize(this);
+        public string ToJsonString() => JsonSerializer.Serialize(this, AdvancedPasteJsonSerializerContext.Default.CustomQuery);
 
         public override string ToString()
-            => JsonSerializer.Serialize(this);
+            => JsonSerializer.Serialize(this, AdvancedPasteJsonSerializerContext.Default.CustomQuery);
 
         public bool UpgradeSettingsConfiguration() => false;
     }