Implement IMetadata interface (#998)

* V1PodTemplateSpec implements IMetadata interface

This will allow using the ModelExteions methods over V1PodTemplateSpec

* Typo

examples/customResource/CustomResourceDefinition.cs

@@ -21,7 +21,7 @@ namespace customResource
         public string Namespace { get; set; }
     }
 
-    public abstract class CustomResource : KubernetesObject
+    public abstract class CustomResource : KubernetesObject, IMetadata<V1ObjectMeta>
     {
         [JsonPropertyName("metadata")]
         public V1ObjectMeta Metadata { get; set; }

src/KubernetesClient.Models/NodeMetrics.cs

@@ -3,7 +3,7 @@ namespace k8s.Models
     /// <summary>
     /// Describes the resource usage metrics of a node pull from metrics server API.
     /// </summary>
-    public class NodeMetrics
+    public class NodeMetrics : IMetadata<V1ObjectMeta>
     {
         /// <summary>
         /// The kubernetes standard object's metadata.

src/KubernetesClient.Models/NodeMetricsList.cs

@@ -1,6 +1,6 @@
 namespace k8s.Models
 {
-    public class NodeMetricsList
+    public class NodeMetricsList : IMetadata<V1ObjectMeta>
     {
         /// <summary>
         /// Defines the versioned schema of this representation of an object.

src/KubernetesClient.Models/PodMetrics.cs

@@ -3,7 +3,7 @@ namespace k8s.Models
     /// <summary>
     /// Describes the resource usage metrics of a pod pull from metrics server API.
     /// </summary>
-    public class PodMetrics
+    public class PodMetrics : IMetadata<V1ObjectMeta>
     {
         /// <summary>
         /// The kubernetes standard object's metadata.

src/KubernetesClient.Models/PodMetricsList.cs

@@ -1,6 +1,6 @@
 namespace k8s.Models
 {
-    public class PodMetricsList
+    public class PodMetricsList : IMetadata<V1ObjectMeta>
     {
         /// <summary>
         /// Defines the versioned schema of this representation of an object.

src/KubernetesClient.Models/V1PodTemplateSpec.cs

@@ -0,0 +1,10 @@
+namespace k8s.Models
+{
+    /// <summary>
+    /// Partial implementation of the IMetadata interface
+    /// to open this class up to ModelExtensions methods
+    /// </summary>
+    public partial class V1PodTemplateSpec : IMetadata<V1ObjectMeta>
+    {
+    }
+}