feat: Expanded Enderchest support (#368)

resolve #367

Author: John-Paul-R

src/main/java/com/fibermc/essentialcommands/commands/bench/EnderchestCommand.java

@@ -1,5 +1,6 @@
 package com.fibermc.essentialcommands.commands.bench;
 
+import com.fibermc.essentialcommands.EssentialCommands;
 import org.jetbrains.annotations.NotNull;
 
 import net.minecraft.network.chat.Component;
@@ -18,8 +19,21 @@ protected Component getScreenTitle() {
     @Override
     protected @NotNull MenuProvider getScreenHandlerFactory() {
         return new SimpleMenuProvider(
-            (syncId, inventory, player) ->
-                ChestMenu.threeRows(syncId, inventory, player.getEnderChestInventory()),
+            (syncId, inventory, player) -> {
+                var echestInventory = player.getEnderChestInventory();
+                if (echestInventory.getContainerSize() == 9 * 3) {
+                    return ChestMenu.threeRows(syncId, inventory, echestInventory);
+                }
+                if (echestInventory.getContainerSize() == 9 * 6) {
+                    return ChestMenu.sixRows(syncId, inventory, echestInventory);
+                }
+                EssentialCommands.LOGGER.warn(
+                    "Expected enderchest to be 9x3 or 9x6 (modded), but found size '{}'."
+                        + " This is unsupported (If this is an intended configuration, report"
+                        + " this along with your log file / mod list at https://github.com/John-Paul-R/Essential-Commands/issues)",
+                    echestInventory.getContainerSize());
+                return ChestMenu.threeRows(syncId, inventory, echestInventory);
+            },
             Component.translatable("container.enderchest")
         );
     }