Add aggressive mob API (#9838)

patches/server/0624-Missing-Entity-API.patch

@@ -837,6 +837,27 @@ index 17f5684cba9d3ed22d9925d1951520cc4751dfe2..3a3563a1bdbc0d84d973b3a04b50b78b
 +    public void setPickupCooldown(int cooldown) {
 +        throw new UnsupportedOperationException("Hopper minecarts don't have cooldowns");
 +    }
++    // Paper end
+ }
+diff --git a/src/main/java/org/bukkit/craftbukkit/entity/CraftMob.java b/src/main/java/org/bukkit/craftbukkit/entity/CraftMob.java
+index 6152f4d3d58f4b598d5bd92dbd7c5428c5ff8bc5..a5d3845acc607f640dace05a85f0089611c7d23a 100644
+--- a/src/main/java/org/bukkit/craftbukkit/entity/CraftMob.java
++++ b/src/main/java/org/bukkit/craftbukkit/entity/CraftMob.java
+@@ -148,4 +148,16 @@ public abstract class CraftMob extends CraftLivingEntity implements Mob {
+         return getHandle().getMaxHeadXRot();
+     }
+     // Paper end
++
++    // Paper start
++    @Override
++    public boolean isAggressive() {
++        return this.getHandle().isAggressive();
++    }
++
++    @Override
++    public void setAggressive(boolean aggressive) {
++        this.getHandle().setAggressive(aggressive);
++    }
 +    // Paper end
  }
 diff --git a/src/main/java/org/bukkit/craftbukkit/entity/CraftMushroomCow.java b/src/main/java/org/bukkit/craftbukkit/entity/CraftMushroomCow.java