Serialization of ATS

[pksorensen]

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

public record FunctionNode(string Function, List<Node> 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.