feat: add a permission requirement to /plot merge all

Core/src/main/java/com/plotsquared/core/command/Merge.java

@@ -109,7 +109,7 @@ public class Merge extends SubCommand {
                 }
             }
             if (direction == null && (args[0].equalsIgnoreCase("all") || args[0]
-                    .equalsIgnoreCase("auto"))) {
+                    .equalsIgnoreCase("auto")) && player.hasPermission(Permission.PERMISSION_MERGE_ALL)) {
                 direction = Direction.ALL;
             }
         }

Core/src/main/java/com/plotsquared/core/permissions/Permission.java

@@ -45,6 +45,7 @@ public enum Permission implements ComponentLike {
     PERMISSION_ADMIN_ENTRY_FORCEFIELD("plots.admin.entry.forcefield"),
     PERMISSION_ADMIN_COMMANDS_CHATSPY("plots.admin.command.chatspy"),
     PERMISSION_MERGE("plots.merge"),
+    PERMISSION_MERGE_ALL("plots.merge.all"),
     PERMISSION_MERGE_OTHER("plots.merge.other"),
     PERMISSION_MERGE_KEEP_ROAD("plots.merge.keeproad"),
     PERMISSION_ADMIN_CAPS_OTHER("plots.admin.caps.other"),