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
 +    }
 +}
 --

Spigot-Server-Patches/EndermanEscapeEvent.patch

@@ -8,7 +8,7 @@ Fires an event anytime an enderman intends to teleport away from the player
 You may cancel this, enabling ranged attacks to damage the enderman for example.
 
 diff --git a/src/main/java/net/minecraft/server/EntityEnderman.java b/src/main/java/net/minecraft/server/EntityEnderman.java
-index 2f59e7071..bf32e386c 100644
+index 2f59e7071..e8ea231dc 100644
 --- a/src/main/java/net/minecraft/server/EntityEnderman.java
 +++ b/src/main/java/net/minecraft/server/EntityEnderman.java
 @@ -0,0 +0,0 @@
@@ -54,7 +54,7 @@ index 2f59e7071..bf32e386c 100644
              boolean flag = super.damageEntity(damagesource, f);
  
 -            if (damagesource.ignoresArmor() && this.random.nextInt(10) != 0) {
-+            if (damagesource.ignoresArmor() && this.random.nextInt(10) != 0 && tryEscape(EndermanEscapeEvent.Reason.CRITICAL_HIT)) { // Paper
++            if (damagesource.ignoresArmor() && this.random.nextInt(10) != 0 && tryEscape(damagesource == DamageSource.DROWN ? EndermanEscapeEvent.Reason.DROWN : EndermanEscapeEvent.Reason.CRITICAL_HIT)) { // Paper
                  this.dm();
              }