Added the Model Comparison assistant for blind comparisons of two models (#1009)

Co-authored-by: Thorsten Sommer <SommerEngineering@users.noreply.github.com>

app/MindWork AI Studio/Assistants/ModelComparison/ModelComparisonJson.cs

@@ -0,0 +1,31 @@
+using System.Text.Encodings.Web;
+using System.Text.Json;
+using System.Text.Json.Serialization;
+
+namespace AIStudio.Assistants.ModelComparison;
+
+/// <summary>
+/// The JSON options of the files of the Model Comparison assistant.
+/// </summary>
+internal static class ModelComparisonJson
+{
+    /// <summary>
+    /// The options with which the assistant writes and reads its files.
+    /// </summary>
+    /// <remarks>
+    /// The files stay readable for people who look into the data folder: indented, enums by name, and umlauts as they
+    /// are rather than as escapes. The relaxed encoder is fine here, because nothing embeds these files into HTML. A
+    /// field this version does not know makes a file unreadable rather than letting a save drop it; the store then
+    /// leaves the file alone.
+    /// </remarks>
+    internal static readonly JsonSerializerOptions PERSISTENCE = new JsonSerializerOptions
+    {
+        PropertyNamingPolicy = JsonNamingPolicy.CamelCase,
+        PropertyNameCaseInsensitive = false,
+        WriteIndented = true,
+        Encoder = JavaScriptEncoder.UnsafeRelaxedJsonEscaping,
+        UnmappedMemberHandling = JsonUnmappedMemberHandling.Disallow,
+        Converters = { new JsonStringEnumConverter() },
+        TypeInfoResolver = ModelComparisonJsonContext.Default,
+    }.AsReadOnly();
+}