Core/Spells: Improved spell category cooldown handling

* Category cooldown is stored with the spell that started the cooldown (and only resetting cooldown on that spell will clear cooldowns on entire category - this fully mirrors client behavior)
* This significantly reduces the amount of data saved to database for cooldowns
* Spell casts from items that have a different category specified than on spell will now check for cooldown during the cast

(cherry picked from commit 1efb3f08e278530f59d681f676b031a7fc6db3ac)

Closes #15766
Closes #15137
Closes #14837

sql/base/characters_database.sql

@@ -1154,6 +1154,8 @@ CREATE TABLE `character_spell_cooldown` (
   `spell` mediumint(8) unsigned NOT NULL DEFAULT '0' COMMENT 'Spell Identifier',
   `item` int(10) unsigned NOT NULL DEFAULT '0' COMMENT 'Item Identifier',
   `time` int(10) unsigned NOT NULL DEFAULT '0',
+  `categoryId` int(10) unsigned NOT NULL DEFAULT '0' COMMENT 'Spell category Id',
+  `categoryEnd` int(10) unsigned NOT NULL DEFAULT '0';
   PRIMARY KEY (`guid`,`spell`)
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8;
 /*!40101 SET character_set_client = @saved_cs_client */;
@@ -2301,6 +2303,8 @@ CREATE TABLE `pet_spell_cooldown` (
   `guid` int(10) unsigned NOT NULL DEFAULT '0' COMMENT 'Global Unique Identifier, Low part',
   `spell` mediumint(8) unsigned NOT NULL DEFAULT '0' COMMENT 'Spell Identifier',
   `time` int(10) unsigned NOT NULL DEFAULT '0',
+  `categoryId` int(10) unsigned NOT NULL DEFAULT '0' COMMENT 'Spell category Id',
+  `categoryEnd` int(10) unsigned NOT NULL DEFAULT '0';
   PRIMARY KEY (`guid`,`spell`)
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8;
 /*!40101 SET character_set_client = @saved_cs_client */;