jspg error refactoring checkpoint

src/validator/error.rs

@@ -1,6 +1,9 @@
+use std::collections::HashMap;
+
 #[derive(Debug, Clone, serde::Serialize)]
 pub struct ValidationError {
   pub code: String,
-  pub message: String,
+  #[serde(skip_serializing_if = "Option::is_none")]
+  pub values: Option<HashMap<String, String>>,
   pub path: String,
 }