refactor: move routing interfaces into their own files

src/PepperDash.Essentials.Core/Routing/IRoutingInputs.cs

@@ -0,0 +1,18 @@
+using PepperDash.Core;
+
+
+namespace PepperDash.Essentials.Core
+{
+    /// <summary>
+    /// Defines a class that has a collection of RoutingInputPorts
+    /// </summary>
+    public interface IRoutingInputs : IKeyed
+	{
+		RoutingPortCollection<RoutingInputPort> InputPorts { get; }
+	}
+
+/*    public interface IRoutingInputs<TSelector> : IKeyed
+    {
+        RoutingPortCollection<RoutingInputPort<TSelector>, TSelector> InputPorts { get; }
+    }*/
+}