fix: change structs to classes for IntOrString and ResourceQuantity, and handle null values in YAML converters

Author: tg123

src/KubernetesClient/Models/IntOrString.cs

@@ -1,9 +1,9 @@
 namespace k8s.Models
 {
     [JsonConverter(typeof(IntOrStringJsonConverter))]
-    public struct IntOrString
+    public class IntOrString
     {
-        public string? Value { get; private init; }
+        public string Value { get; private init; }
 
         public static implicit operator IntOrString(int v)
         {
@@ -17,7 +17,7 @@ public static implicit operator IntOrString(long v)
 
         public static implicit operator string(IntOrString v)
         {
-            return v.Value;
+            return v?.Value;
         }
 
         public static implicit operator IntOrString(string v)

src/KubernetesClient/Models/IntOrStringYamlConverter.cs

@@ -35,7 +35,7 @@ public object ReadYaml(IParser parser, Type type, ObjectDeserializer rootDeseria
         public void WriteYaml(IEmitter emitter, object value, Type type, ObjectSerializer serializer)
         {
             var obj = (IntOrString)value;
-            emitter?.Emit(new YamlDotNet.Core.Events.Scalar(obj.Value));
+            emitter?.Emit(new YamlDotNet.Core.Events.Scalar(obj?.Value));
         }
     }
 }

src/KubernetesClient/Models/ResourceQuantity.cs

@@ -54,7 +54,7 @@ namespace k8s.Models
     ///     cause implementors to also use a fixed point implementation.
     /// </summary>
     [JsonConverter(typeof(ResourceQuantityJsonConverter))]
-    public struct ResourceQuantity
+    public class ResourceQuantity
     {
         public enum SuffixFormat
         {

src/KubernetesClient/Models/ResourceQuantityYamlConverter.cs

@@ -35,7 +35,7 @@ public object ReadYaml(IParser parser, Type type, ObjectDeserializer rootDeseria
         public void WriteYaml(IEmitter emitter, object value, Type type, ObjectSerializer serializer)
         {
             var obj = (ResourceQuantity)value;
-            emitter?.Emit(new YamlDotNet.Core.Events.Scalar(obj.ToString()));
+            emitter?.Emit(new YamlDotNet.Core.Events.Scalar(obj?.ToString()));
         }
     }
 }