feat: add DamageListener to handle and cancel player damage events

Author: TheBjoRedCraft

src/main/kotlin/dev/slne/surf/lobby/PaperMain.kt

@@ -4,10 +4,7 @@ import com.github.shynixn.mccoroutine.folia.SuspendingJavaPlugin
 import dev.slne.surf.lobby.command.lobbyCommand
 import dev.slne.surf.lobby.config.LobbyConfigHolder
 import dev.slne.surf.lobby.hologram.SurfHologramHook
-import dev.slne.surf.lobby.listener.DoubleJumpListener
-import dev.slne.surf.lobby.listener.GameModeListener
-import dev.slne.surf.lobby.listener.SpawnLocationListener
-import dev.slne.surf.lobby.listener.WorldProtectionListener
+import dev.slne.surf.lobby.listener.*
 import dev.slne.surf.lobby.npc.SurfNpcHook
 import dev.slne.surf.surfapi.bukkit.api.event.register
 import org.bukkit.Bukkit
@@ -29,6 +26,7 @@ class PaperMain : SuspendingJavaPlugin() {
         SpawnLocationListener.register()
         GameModeListener.register()
         WorldProtectionListener.register()
+        DamageListener.register()
 
         lobbyCommand()
     }

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

@@ -0,0 +1,18 @@
+@file:Suppress("UnstableApiUsage")
+
+package dev.slne.surf.lobby.listener
+
+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.EntityDamageEvent
+
+object DamageListener : Listener {
+    @EventHandler
+    fun onDamage(event: EntityDamageEvent) {
+        if (event.entity is Player) {
+            event.cancel()
+        }
+    }
+}