Is your feature request related to a problem? Please describe.

Lib: csharp-netcore

I want to do a "Patch" request to update some entries.
For this reason its needed that "null" values are not serialized. If a property is not serialized it will be ignored from the service.

Describe the solution you'd like

To solve this i want to add a custom Json serializer. Inside this I'm able to say that null values will be ignored.

example how it worket after i changed the generated code:

        private RestRequest newRequest(
            HttpMethod method,
            String path,
            RequestOptions options,
            IReadableConfiguration configuration)
        {

....
            RestRequest request = new RestRequest(Method(method))
            {
                Resource = path,
                JsonSerializer = new CustomJsonCodec(new JsonSerializerSettings
                {
                  NullValueHandling = NullValueHandling.Ignore
                },configuration)
            };

But we want to make it more generic :-)
The creation of this request is wrapped by the generated client. And there is actual no way to pass a custom Json serializer. I think its a good idea to pass a custon serializer together wirh the configuration. With this the client can configure what he want.

Describe alternatives you've considered

Its also possible to add some configurations like NullValueHandling = NullValueHandling.Ignore directly to the config. But i think thats not so suitable.

Additional context