Feature: Share open link to meeting room for public use.

### Description of the issue

A good use case for us would be the ability to hold webinars using a meeting room. When I click Copy Guest Link in the meeting room, the link prompts for a sign up. It would be nice if the link just asked for a name and allowed someone to join without signing up.

### Your environment

* Version of Huly: Public and Self-Host (v0.6.313)
* Browser (and version): Firefox 115
* Your operating system (and version): Linux Debian 12

### Steps to reproduce

Please produce the steps for us to reproduce this issue.

Join a meeting room, copy guest link, open guest link in private window.

### Expected behaviour

Join a meeting room, copy public guest link, open guest link in private window... join room with an optional (or required) name only.

### Actual behaviour

Tell us what happens instead (include screenshots or logs).

Prompted for sign up with email/password. Can see other stuff besides meeting, as well.

### Possible solutions

(Not obligatory)
Just spitballing: Encode an authentication token into the link that's valid for some period of time. The authentication allows access to the love room. Maybe require name and email (since that's useful for marketing purposes for webinars). Maybe allow admins to configure what information is required to use the guest link.