[Feature] Enable bazaar window 'Find Trader' functionality (#4560)

* First pass to enable trader 'Find Trader' functionality

* Move SendBulkTraders out of zoning routines and send as part of the opening of the bazaar search window.
Add zone instance to SendBulkTraders to support multi-instanced bazaars.

common/database/database_update_manifest.cpp

@@ -5770,6 +5770,17 @@ MODIFY COLUMN `exp_modifier` float NOT NULL DEFAULT 1.0 AFTER `aa_modifier`;
 CREATE INDEX idx_character_expires ON data_buckets (character_id, expires);
 CREATE INDEX idx_npc_expires ON data_buckets (npc_id, expires);
 CREATE INDEX idx_bot_expires ON data_buckets (bot_id, expires);
+)"
+	},
+	ManifestEntry{
+		.version = 9286,
+		.description = "2024_11_26_bazaar_find_trader.sql",
+		.check       = "SHOW COLUMNS FROM `trader` LIKE 'char_zone_instance_id'",
+		.condition   = "empty",
+		.match       = "",
+		.sql         = R"(
+ALTER TABLE `trader`
+	ADD COLUMN `char_zone_instance_id` INT NULL DEFAULT '0' AFTER `char_zone_id`;
 )"
 	}
 // -- template; copy/paste this when you need to create a new entry