API v1.23.0 + system.text.json + remove WatchXXX API (#750)

* gen v1.23.0

* fix converter

* bump ver

* update readme runtime

* fix warning

* update dep ver

* newtonjson -> system.text.json

* generate for new json api

* readme lf

* dotnet fmt

* dotnet fmt tests/

* dotnet fmt

* Revert "dotnet fmt"

This reverts commit e14c59076143fe2218ed899295a00762f0ea2bd6.

* fix err introduce by dotnet fmt

* fix test

* remove deprecated /watch api

* generate code after /watch removed

* remove /watch related code

* trim Microsoft.Rest.Serialization

src/KubernetesClient/KubernetesObject.cs

@@ -1,5 +1,3 @@
-using Newtonsoft.Json;
-
 namespace k8s
 {
     /// <summary>
@@ -20,7 +18,7 @@ namespace k8s
         /// values. More info:
         /// https://git.k8s.io/community/contributors/devel/api-conventions.md#resources
         /// </summary>
-        [JsonProperty(PropertyName = "apiVersion")]
+        [JsonPropertyName("apiVersion")]
         public string ApiVersion { get; set; }
 
         /// <summary>
@@ -30,7 +28,7 @@ namespace k8s
         /// More info:
         /// https://git.k8s.io/community/contributors/devel/api-conventions.md#types-kinds
         /// </summary>
-        [JsonProperty(PropertyName = "kind")]
+        [JsonPropertyName("kind")]
         public string Kind { get; set; }
     }
 }