Scripts/InstanceScript: Implement database framework for managing spawn groups based on boss state.

Port From (https://github.com/TrinityCore/TrinityCore/commit/608c9aaabfcdbaf09edd11cdf268c243b3e69478)

sql/updates/world/master/2020_08_22_02_world_2017_08_04_00_world.sql

@@ -0,0 +1,10 @@
+--
+DROP TABLE IF EXISTS `instance_spawn_groups`;
+CREATE TABLE `instance_spawn_groups` (
+  `instanceMapId` smallint(5) unsigned not null,
+  `bossStateId` tinyint(3) unsigned not null,
+  `bossStates` tinyint(3) unsigned not null,
+  `spawnGroupId` int(10) unsigned not null,
+  `flags` tinyint(3) unsigned not null,
+  PRIMARY KEY (`instanceMapId`,`bossStateId`,`spawnGroupId`,`bossStates`)
+) ENGINE=MyISAM DEFAULT CHARSET=utf8;