[Zone] Implement zone player count sharding (#4536)

* [Zone] Implement zone player count sharding

* Update client.cpp

* Update database_instances.cpp

* You must request a shard change from the zone you are currently in.

* // zone sharding

* You cannot request a shard change while in combat.

* Query adjustment

* Use safe coords

* Changes

* Fixes to instance query

* Push

* Push

* Final push

* Update client.cpp

* Update eq_packet_structs.h

* Remove pick menu

* Comment

* Update character_data_repository.h

* Update zoning.cpp

---------

Co-authored-by: Kinglykrab <kinglykrab@gmail.com>

common/database/database_update_manifest.cpp

@@ -5791,6 +5791,18 @@ ALTER TABLE `trader`
 		.match       = "float",
 		.sql         = R"(
 ALTER TABLE `npc_types` MODIFY COLUMN `walkspeed` float NOT NULL DEFAULT 0;
+)",
+		.content_schema_update = true
+	},
+	ManifestEntry{
+		.version = 9288,
+		.description = "2024_11_10_zone_player_partitioning.sql",
+		.check = "SHOW CREATE TABLE `zone`",
+		.condition = "missing",
+		.match = "shard_at_player_count",
+		.sql = R"(
+ALTER TABLE `zone`
+ADD COLUMN `shard_at_player_count` int(11) NULL DEFAULT 0 AFTER `seconds_before_idle`;
 )",
 		.content_schema_update = true
 	}