refactor: rearrange and add solution for 4-series

src/PepperDash.Essentials.Devices.Common/Codec/IHasCallHold.cs

@@ -0,0 +1,23 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using Crestron.SimplSharp;
+
+namespace PepperDash.Essentials.Devices.Common.Codec
+{
+    public interface IHasCallHold
+    {
+        /// <summary>
+        /// Put the specified call on hold
+        /// </summary>
+        /// <param name="activeCall"></param>
+        void HoldCall(CodecActiveCallItem activeCall);
+
+        /// <summary>
+        /// Resume the specified call
+        /// </summary>
+        /// <param name="activeCall"></param>
+        void ResumeCall(CodecActiveCallItem activeCall);
+    }
+}