add Escape Reason Drown for EndermanEscapeEvent

to detect rain specifically from every other armor ignoring hit

Spigot-API-Patches/EndermanEscapeEvent.patch

@@ -9,7 +9,7 @@ You may cancel this, enabling ranged attacks to damage the enderman for example.
 
 diff --git a/src/main/java/com/destroystokyo/paper/event/entity/EndermanEscapeEvent.java b/src/main/java/com/destroystokyo/paper/event/entity/EndermanEscapeEvent.java
 new file mode 100644
-index 00000000..b8de1037
+index 00000000..0d15a8ab
 --- /dev/null
 +++ b/src/main/java/com/destroystokyo/paper/event/entity/EndermanEscapeEvent.java
 @@ -0,0 +0,0 @@
@@ -88,7 +88,11 @@ index 00000000..b8de1037
 +        /**
 +         * The enderman has teleported away due to the player staring at it during combat
 +         */
-+        STARE
++        STARE,
++        /**
++         * Specific case for CRITICAL_HIT where the enderman is taking rain damage
++         */
++        DROWN
 +    }
 +}
 --