feat: extend DamageListener to cancel player damage from other players

- Added handling for `EntityDamageByEntityEvent` to cancel damage caused by players.

Author: TheBjoRedCraft

src/main/kotlin/dev/slne/surf/lobby/listener/DamageListener.kt

@@ -6,6 +6,7 @@ import dev.slne.surf.surfapi.bukkit.api.event.cancel
 import org.bukkit.entity.Player
 import org.bukkit.event.EventHandler
 import org.bukkit.event.Listener
+import org.bukkit.event.entity.EntityDamageByEntityEvent
 import org.bukkit.event.entity.EntityDamageEvent
 
 object DamageListener : Listener {
@@ -15,4 +16,11 @@ object DamageListener : Listener {
             event.cancel()
         }
     }
+
+    @EventHandler
+    fun onDamageByEntity(event: EntityDamageByEntityEvent) {
+        if (event.damager is Player) {
+            event.cancel()
+        }
+    }
 }