feat: cache metadata in ModDetails

Allows for more easy access to the metadata by outside entities

launcher/minecraft/mod/ModDetails.h

@@ -1,8 +1,12 @@
 #pragma once
 
+#include <memory>
+
 #include <QString>
 #include <QStringList>
 
+#include "minecraft/mod/MetadataHandler.h"
+
 struct ModDetails
 {
     /* Mod ID as defined in the ModLoader-specific metadata */
@@ -25,4 +29,7 @@ struct ModDetails
 
     /* List of the author's names */
     QStringList authors;
+
+    /* Metadata information, if any */
+    std::shared_ptr<Metadata::ModStruct> metadata;
 };