Parkour implementation safety save 2

This is just a safety save in case the code gets too broken to fix.

src/main/java/net/knarcraft/minigames/command/LeaveArenaCommand.java

@@ -0,0 +1,46 @@
+package net.knarcraft.minigames.command;
+
+import net.knarcraft.minigames.MiniGames;
+import net.knarcraft.minigames.arena.dropper.DropperArenaSession;
+import org.bukkit.command.Command;
+import org.bukkit.command.CommandSender;
+import org.bukkit.command.TabExecutor;
+import org.bukkit.entity.Player;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * The command used to leave the current dropper arena
+ */
+public class LeaveArenaCommand implements TabExecutor {
+
+    @Override
+    public boolean onCommand(@NotNull CommandSender commandSender, @NotNull Command command, @NotNull String s,
+                             @NotNull String[] strings) {
+        if (!(commandSender instanceof Player player)) {
+            commandSender.sendMessage("This command must be used by a player");
+            return false;
+        }
+
+        DropperArenaSession existingSession = MiniGames.getInstance().getDropperArenaPlayerRegistry().getArenaSession(
+                player.getUniqueId());
+        if (existingSession == null) {
+            commandSender.sendMessage("You are not in a dropper arena!");
+            return false;
+        }
+
+        existingSession.triggerQuit(false);
+        return true;
+    }
+
+    @Nullable
+    @Override
+    public List<String> onTabComplete(@NotNull CommandSender commandSender, @NotNull Command command, @NotNull String s,
+                                      @NotNull String[] arguments) {
+        return new ArrayList<>();
+    }
+
+}