Add key for item model

Author: avaruus1

src/main/java/org/spongepowered/api/data/Keys.java

@@ -2437,6 +2437,11 @@ public final class Keys {
      */
     public static final Key<Value<Ticks>> MIN_SPAWN_DELAY = Keys.key(ResourceKey.sponge("min_spawn_delay"), Ticks.class);
 
+    /**
+     * Location for the model of an {@link ItemStack}
+     */
+    public static final Key<Value<ResourceKey>> MODEL = Keys.key(ResourceKey.sponge("model"), ResourceKey.class);
+
     /**
      * The moisture value of a {@link BlockTypes#FARMLAND} {@link BlockState}.
      */