test: setup common stability and robustness properties tracking

lib/volume/nvi/Nvi.Quantower.Tests.cs

@@ -184,4 +184,4 @@ public class NviIndicatorTests
 
         Assert.True(secondVal > firstVal, $"NVI should increase when volume decreases and price rises: {secondVal} vs {firstVal}");
     }
-}
+}

lib/volume/nvi/Nvi.Tests.cs

@@ -426,4 +426,4 @@ public class NviTests
 
         Assert.True(nvi.IsHot);
     }
-}
+}

lib/volume/nvi/Nvi.Validation.Tests.cs

@@ -260,4 +260,4 @@ public sealed class NviValidationTests : IDisposable
         nvi.Update(new TBar(time.AddMinutes(3), 110, 112, 98, 100, 70000));
         Assert.Equal(1050 * (100.0 / 110.0), nvi.Last.Value, 6);
     }
-}
+}