#378: Add API to check and set if horses are grazing hay

By: Matthew <stteg@hotmail.com>

paper-server/src/main/java/org/bukkit/craftbukkit/entity/CraftAbstractHorse.java

@@ -97,6 +97,16 @@ public abstract class CraftAbstractHorse extends CraftAnimals implements Abstrac
         getHandle().setOwnerUUID(uuid);
     }
 
+    @Override
+    public boolean isEatingHaystack() {
+        return getHandle().isEating();
+    }
+
+    @Override
+    public void setEatingHaystack(boolean eatingHaystack) {
+        getHandle().setEating(eatingHaystack);
+    }
+
     @Override
     public AbstractHorseInventory getInventory() {
         return new CraftInventoryAbstractHorse(getHandle().inventory);