SPIGOT-5255: Raid / patrol spawn reasons

By: md_5 <git@md-5.net>

paper-api/src/main/java/org/bukkit/event/entity/CreatureSpawnEvent.java

@@ -161,6 +161,14 @@ public class CreatureSpawnEvent extends EntitySpawnEvent {
          * When eg an effect cloud is spawned as a result of a creeper exploding
          */
         EXPLOSION,
+        /**
+         * When an entity is spawned as part of a raid
+         */
+        RAID,
+        /**
+         * When an entity is spawned as part of a patrol
+         */
+        PATROL,
         /**
          * When a creature is spawned by plugins
          */