feat: added setter for CharacterConfig in JSON

src/main/java/uulm/teamname/marvelous/gamelibrary/json/JSON.java

@@ -131,4 +131,10 @@ public class JSON {
             return Optional.empty();
         }
     }
+
+    public void setCharacterConfig(CharacterConfig config) {
+        this.mapper.setInjectableValues(new InjectableValues
+                .Std()
+                .addValue("CharacterConfig", config));
+    }
 }