[Zones] Add Max Level Check to Zones. (#2714)

* [Zones] Add Max Level Check to Zones.

# Perl
- Add `$client->CanEnterZone(zone_short_name)`.
- Add `$client->CanEnterZone(zone_short_name, instance_version)`.

# Lua
- Add `client:CanEnterZone(zone_short_name)`.
- Add `client:CanEnterZone(zone_short_name, instance_version)`.

# Notes
- Allows operators to limit zones to a maximum level.
- Allows operators to see if a player can enter a zone before sending them.
- Keeps players from entering via `#peqzone` and `#zone` as well if they do not meet the requirements or are not high enough status to bypass the requirements.

* Cleanup.

utils/sql/git/required/2023_01_08_zone_max_level.sql

@@ -0,0 +1,2 @@
+ALTER TABLE `zone` 
+ADD COLUMN `max_level` tinyint(3) UNSIGNED NOT NULL DEFAULT 255 AFTER `min_level`;