Serialization of ATS

We need to figure out how we want to handle serialization:


```
public record FunctionNode(string Function, List Arguments) : Node
```

As its not strait forward to just added [JsonProperty] to record properties here as
1) Should we add system.text.json as dependency
2) Should we add newtonsoft as dependency

If we want to keep it not so tight coubled , we could add Compo.System.Text.Json and Compo.NewtonSoft.Json and add converters/serializers for the node types there and packages can be installed depending on what serialization one would want.