[Shared Tasks] Implement task timer groups (#2340)

This adds task replay and request timer groups (an arbitrary id) which
allows for different tasks to share lockouts

utils/sql/git/required/2022_07_16_task_timer_groups.sql

@@ -0,0 +1,6 @@
+ALTER TABLE `tasks`
+  ADD COLUMN `replay_timer_group` INT UNSIGNED NOT NULL DEFAULT '0' AFTER `completion_emote`,
+  ADD COLUMN `request_timer_group` INT UNSIGNED NOT NULL DEFAULT '0' AFTER `replay_timer_seconds`;
+
+ALTER TABLE `character_task_timers`
+  ADD COLUMN `timer_group` INT NOT NULL DEFAULT '0' AFTER `timer_type`;