Resolve "Invalid schema reference when using tuple struct"

Closes #4 (closed)

The issue was being caused when reference resolution is performed, but the resolved schema itself contains unresolved references internally. Those were not being handled.

This MR adds an additional step that resolves references in the extracted schema as well, before placing it in its target place.

src/lib.rs

@@ -81,12 +81,15 @@ impl SchemaInspector {
     /// to retrieve them from the root schemas object
     fn resolve_references(schemas: &Map<String, Value>, val: &mut Value) -> Result<(), InitError> {
         if let Some(target) = Self::extract_ref(val) {
-            *val = schemas
+            let mut resolved_schema = schemas
                 .get(&target)
                 .ok_or(InitError::ResolutionFailure(format!(
                     "{target} not found in the given schemas"
                 )))?
                 .clone();
+            // resolve any references within the resolved schema
+            Self::resolve_references(schemas, &mut resolved_schema)?;
+            *val = resolved_schema;
         }
         match val {
             Value::Object(ref mut map) => {