Add new IHandleClientDispose interface shared by Pooled Managers

Author: mythz

src/ServiceStack.Redis/IHandleClientDispose.cs

@@ -0,0 +1,7 @@
+namespace ServiceStack.Redis
+{
+    public interface IHandleClientDispose
+    {
+        void DisposeClient(RedisNativeClient client);
+    }
+}