Wireguard unavailable as an option when adding a new VPN

### What Happened?

Wireguard support was released a while back, but I've never gotten it to work. I'm currently running elementary OS 8, and I have the `wireguard` package installed. Rebooting didn't help.

See screenshot below showing the "add new VPN" dialog:


I tried to import from a connection file (i.e. a file backed up from `/etc/NetworkManager/system-connections/`), but it says it's unsupported when I pick it.


### Steps to Reproduce

1. Install and update elementary OS 8.
2. Install `wireguard` package and reboot
3. open _Settings_, then _Network_, then _VPN_, then _Add a Connection_

### Expected Behavior

There should be a way to manually add a Wireguard connection, filling in details in a form; or at least let us import from a file. None of that appears to be available.

### OS Version

8.x (Circe)

### Session Type

Secure Session (Wayland)

### Software Version

Latest release (I have run all updates)

### Log Output

_No response_

### Hardware Info

- Dell Inspiron 15 3583 (amd64 laptop)