Is there any way to trigger a timer when a plugin is enabled and cancel timer when plugin is disabled?

[吴治国]

Hi community
  I met a problem when setting a timer in plugin, and I may need some help.
  I want to trigger a timer when plugin is enabled, but the init phase will 
execute whatever the plugin is enabled or not.
  And canceled the timer when plugin is disabled, But I haven't found any API 
to cancel a timer created by `ngx.timer.every()`
  Is there any way I can achieve my goal?

  Issue: https://github.com/apache/apisix/issues/6786 
<https://github.com/apache/apisix/issues/6786>

Thanks.