Tickets Webhook and API additions

[aconite]

Hi There,

It would be helpful if there was a webhook event for when a ticket was escalated.

Also, the API endpoint of /ticket/<id> isn't implemented, I was able to add it manually in the routes along with a nf_ticket:read scope and it seems to work fine, but if that could get fully implemented it would be great. I also made a slight modification to Entity/Tickets.php for our use to add 'api' => true to the title col. The goal was so we could have a Discord message with the following format:

<username> created a new ticket <name> in <department>: <url to ticket>

Thanks!