Using System.Text.Json Source Generator

[IvanJosipovic]

I'm playing with utilizing the Source Generator approach in the Json Serializer in order to optimize performance of informers.

Benefits of this approach:

See these two docs:

• https://devblogs.microsoft.com/dotnet/try-the-new-system-text-json-source-generator/
• https://learn.microsoft.com/en-us/dotnet/standard/serialization/system-text-json/source-generation

Unfortunately, I've hit a snag due to the existing Json converters being internal.

Options:

1. Make existing converters public
2. Add Source Generation to this library
   1. It appears fairly simple to implement

   2.   KubernetesJson.AddJsonOptions(x => x.TypeInfoResolver = JsonTypeInfoResolver.Combine(SourceGenerationContext.Default, JsonSerializerOptions.Default.TypeInfoResolver));
      
        [JsonSerializable(typeof(V1Node))]
        [JsonSerializable(typeof(V1Namespace))]
        .. add all other types
        internal partial class SourceGenerationContext : JsonSerializerContext
        {
        }
      

Thoughts?

### Tasks
- [ ] https://github.com/kubernetes-client/csharp/pull/1417

[tg123]

it is so cool, it is worth to have those converters public

[tg123]

merge into #1395