Implement awake flag for bats. Adds BUKKIT-5606

By: Wesley Wolfe <wesley.d.wolfe+git@gmail.com>

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

@@ -23,4 +23,14 @@ public class CraftBat extends CraftAmbient implements Bat {
     public EntityType getType() {
         return EntityType.BAT;
     }
+
+    @Override
+    public boolean isAwake() {
+        return getHandle().isStartled();
+    }
+
+    @Override
+    public void setAwake(boolean state) {
+        getHandle().setStartled(state);
+    }
 }