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/ModelComparisonAnswer.cs

@@ -0,0 +1,37 @@
+namespace AIStudio.Assistants.ModelComparison;
+
+/// <summary>
+/// What one model answered, together with how the request went.
+/// </summary>
+public sealed record ModelComparisonAnswer
+{
+    /// <summary>
+    /// The name to show for the model. It says who wrote the answer, and is not shown until the
+    /// user has voted.
+    /// </summary>
+    public required string Label { get; init; }
+
+    /// <summary>
+    /// The answer without the thinking of the model. Only an answer which is
+    /// Completed is complete: after a failure or a cancellation, this is whatever
+    /// arrived before, and it must not be shown as a result.
+    /// </summary>
+    public required string Text { get; init; }
+
+    /// <summary>
+    /// Whether the model answered. False when the request failed, when the user canceled it, and
+    /// when the model ended without saying anything.
+    /// </summary>
+    public required bool Completed { get; init; }
+
+    /// <summary>
+    /// The time from sending the request until the first piece of the answer arrived, or null when
+    /// nothing arrived.
+    /// </summary>
+    public TimeSpan? FirstTokenTime { get; init; }
+
+    /// <summary>
+    /// The time from sending the request until the answer was complete, or null when it never was.
+    /// </summary>
+    public TimeSpan? TotalTime { get; init; }
+}