Added the KICK_WHITELIST Result for players being kicked from not being on the whitelist, just because KICK_BANNED didn't seem to fit.

By: HACKhalo2 <hackhalotwo@gmail.com>

paper-api/src/main/java/org/bukkit/event/player/PlayerLoginEvent.java

@@ -96,6 +96,11 @@ public class PlayerLoginEvent extends PlayerEvent {
          */
         KICK_BANNED,
         
+        /**
+         * The player is not allowed to log in, due to them not being on the white list
+         */
+        KICK_WHITELIST,
+        
         /**
          * The player is not allowed to log in, for reasons undefined
          */