add zip<T1, T2, T3>()

src/TensorFlowNET.Core/Binding.Util.cs

@@ -165,6 +165,12 @@ namespace Tensorflow
                 yield return (t1[i], t2[i]);
         }
 
+        public static IEnumerable<(T1, T2, T3)> zip<T1, T2, T3>(IList<T1> t1, IList<T2> t2, IList<T3> t3)
+        {
+            for (int i = 0; i < t1.Count; i++)
+                yield return (t1[i], t2[i], t3[i]);
+        }
+
         public static IEnumerable<(T1, T2)> zip<T1, T2>(NDArray t1, NDArray t2) 
             where T1: unmanaged
             where T2: unmanaged
@@ -203,6 +209,7 @@ namespace Tensorflow
                 yield return (i, values[i]);
         }
 
+        [DebuggerStepThrough]
         public static Dictionary<string, object> ConvertToDict(object dyn)
         {
             var dictionary = new Dictionary<string, object>();