Add AddJsonOptions to KubernetesClientConfiguration and KubernetesJson (#1257)

* Use camelCase policy when serializing enums

* Revert "Use camelCase policy when serializing enums"

This reverts commit 467f49d8734bcbd6aabb87447fbd7d21840c4c48.

* Add jonSerializerOptions to GenericClient

* Add jsonSerializerOptions param

* Revert pass deserialization options in GenericClient

* Add JsonSerializerOptions to KubernetesClientConfiguration

* Use user JsonSerializerOptions in SendRequest and CreateResultAsync

* Improve comment

* Remove JsonSerializerOptions

* Cosmetic

* Add AddJsonOptions

* Fix example

* Fix test

* Add test

* Add summary

* Improve summary

* Remove configure from Kubernetes ctor and tests

* Add AddJsonOptions to config and test

* Support per client json serializer options

* Add ConfigureAwait for tests

* Check for nullargument

src/KubernetesClient/Kubernetes.ConfigInit.cs

@@ -9,6 +9,8 @@ namespace k8s
 {
     public partial class Kubernetes
     {
+        private readonly JsonSerializerOptions jsonSerializerOptions;
+
         /// <summary>
         ///     Initializes a new instance of the <see cref="Kubernetes" /> class.
         /// </summary>
@@ -27,6 +29,7 @@ namespace k8s
             CreateHttpClient(handlers, config);
             InitializeFromConfig(config);
             HttpClientTimeout = config.HttpClientTimeout;
+            jsonSerializerOptions = config.JsonSerializerOptions;
 #if NETSTANDARD2_1_OR_GREATER || NET5_0_OR_GREATER
             DisableHttp2 = config.DisableHttp2;
 #endif
@@ -155,8 +158,6 @@ namespace k8s
             };
         }
 
-
-
         /// <summary>
         ///     Set credentials for the Client
         /// </summary>