feat(Core/Player): Implement player specific settings (#9483)

data/sql/updates/pending_db_characters/rev_1638643807174948000.sql

@@ -0,0 +1,9 @@
+INSERT INTO `version_db_characters` (`sql_rev`) VALUES ('1638643807174948000');
+
+DROP TABLE IF EXISTS `character_settings`;
+CREATE TABLE IF NOT EXISTS `character_settings` (
+  `guid` INT UNSIGNED NOT NULL,
+  `source` VARCHAR(40) NOT NULL,
+  `data` TEXT NULL,
+  PRIMARY KEY (`guid`, `source`)
+) ENGINE=MYISAM DEFAULT CHARSET=utf8mb4 COMMENT='Player Settings';