fix: files not serialized

Author: furesoft

src/Moss.NET.Sdk/Assets.cs

@@ -1,6 +1,7 @@
 using System;
 using System.Collections.Generic;
 using System.IO;
+using Extism;
 
 namespace Moss.NET.Sdk;
 

src/Moss.NET.Sdk/ExtensionInfo.cs

@@ -5,5 +5,5 @@ namespace Moss.NET.Sdk;
 
 public class ExtensionInfo
 {
-    [JsonPropertyName("files")] internal List<File> Files { get; set; }
+    [JsonPropertyName("files")] public List<File> Files { get; internal set; }
 }