server: Add the attribute schema to the attributes in graphql

And make sure that we only request the schema once per top-level query

server/src/domain/schema.rs

@@ -4,7 +4,7 @@ use crate::domain::{
 };
 use serde::{Deserialize, Serialize};
 
-#[derive(PartialEq, Eq, Debug, Serialize, Deserialize)]
+#[derive(PartialEq, Eq, Debug, Serialize, Deserialize, Clone)]
 pub struct PublicSchema(Schema);
 
 impl PublicSchema {