Make some compiler types serde-serializable

[goto-bus-stop]

Especially for checked Name it would be great if you could use it in a serde (de)serializable structure and get the name value checked during deserialization.

Const values could maybe be deserializable as well, see also #717 (for non-const values, we'd need a way to pass in variable values, so supporting serde would probably not be possible)

Other types?

[SimonSapin]

I don’t think there’s a problem with non-const AST values. Value::Variable contains the name of the referenced variable, we can (de)serialize that.

(PR upcoming doing that)

[goto-bus-stop]

Ah yes. I think what I meant was actually unrelated to this issue. It was about deriving Deserialize for custom structs and using that with a custom deserializer to parse argument Values into Rust types, which would need to handle variables, but that's doesn't need to be a problem (eg. the api could be let s: MyStruct = apollo_rs::serde::from_arguments(&arguments, &variables))