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/ModelComparisonSeriesEffort.cs

@@ -0,0 +1,28 @@
+namespace AIStudio.Assistants.ModelComparison;
+
+/// <summary>
+/// How much the user had to do with a model of a comparison series until the task was done.
+/// </summary>
+public sealed record ModelComparisonSeriesEffort
+{
+    /// <summary>
+    /// The model.
+    /// </summary>
+    public required ModelComparisonModelIdentity Model { get; init; }
+
+    /// <summary>
+    /// How many decided tasks count.
+    /// </summary>
+    public int TaskCount { get; init; }
+
+    /// <summary>
+    /// How many messages the user wrote on average, the first one included, or null without a decided task.
+    /// </summary>
+    public double? AverageUserMessages { get; init; }
+
+    /// <summary>
+    /// How long the user worked with the model in the middle: half of the tasks took less, half took more. The median,
+    /// since a chat left open over night would distort an average. Null without a decided task.
+    /// </summary>
+    public TimeSpan? MedianDuration { get; init; }
+}