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/ModelComparisonPairKey.cs

@@ -0,0 +1,19 @@
+namespace AIStudio.Assistants.ModelComparison;
+
+/// <summary>
+/// Two models compared with each other, in the same order whichever of them was the first model of a comparison.
+/// </summary>
+/// <param name="First">The model which comes first by ModelComparisonModelKey.CompareTo.</param>
+/// <param name="Second">The other model.</param>
+public readonly record struct ModelComparisonPairKey(ModelComparisonModelKey First, ModelComparisonModelKey Second)
+{
+    /// <summary>
+    /// Gets the pair of two models.
+    /// </summary>
+    /// <param name="one">One model.</param>
+    /// <param name="other">The other model.</param>
+    /// <returns>The pair, in its own order.</returns>
+    public static ModelComparisonPairKey Of(ModelComparisonModelKey one, ModelComparisonModelKey other) => one.CompareTo(other) <= 0
+        ? new(one, other)
+        : new(other, one);
+}