embed KubernetesClient.Models and KubernetesClient.Basic into client sdk (#1407)

* cleanup using

* cleanup classic

* clean up nuget

* bump ver

* fix pipeline

* remove commit by accident

src/KubernetesClient.Models/KubernetesYaml.cs

@@ -1,8 +1,5 @@
-using k8s.Models;
-using System.IO;
 using System.Reflection;
 using System.Text;
-using System.Threading.Tasks;
 using YamlDotNet.Core;
 using YamlDotNet.Core.Events;
 using YamlDotNet.Serialization;