feat: added inventory method to get inventory as array

src/main/java/uulm/teamname/marvelous/gamelibrary/entities/Inventory.java

@@ -80,6 +80,16 @@ public class Inventory implements Iterable<StoneType> {
         content.remove(stone);
     }
 
+    /** Returns the stones inside of the Inventory as Array of {@link StoneType StoneTypes} */
+    public StoneType[] getStonesAsArray() {
+        var toReturn = new StoneType[content.size()];
+        var iterator = content.iterator();
+        for (int i = 0; i < content.size(); i++) {
+            toReturn[i] = iterator.next();
+        }
+        return toReturn;
+    }
+
     /** Iterates over the inventory. */
     @Override
     public Iterator<StoneType> iterator() {