FEATURE: Trigger user webhook when a user logs in/out.

https://meta.discourse.org/t/how-do-you-learn-how-to-build-these-plugins/57946/10?u=tgxworld

config/initializers/012-web_hook_events.rb

@@ -22,7 +22,13 @@ DiscourseEvent.on(:post_edited) do |post, topic_changed|
   WebHook.enqueue_topic_hooks(:topic_edited, post.topic) if post.is_first_post? && topic_changed
 end
 
-%i(user_created user_approved user_updated).each do |event|
+%i(
+  user_logged_out
+  user_created
+  user_logged_in
+  user_approved
+  user_updated
+).each do |event|
   DiscourseEvent.on(event) do |user|
     WebHook.enqueue_hooks(:user, user_id: user.id, event_name: event.to_s)
   end