feat(Scripts/Commands): Implement debug zonestats command (#23249)

data/sql/updates/pending_db_world/rev_1760478939949751800.sql

@@ -0,0 +1,4 @@
+--
+DELETE FROM `command` WHERE `name` = 'debug zonestats';
+INSERT INTO `command` (`name`, `security`, `help`) VALUES
+('debug zonestats', 1, '.debug zonestats [$playerName]\nDisplays the amount of players in the player\'s current zone.');