Feature request: Support configuration for TURNS / STUNS

First, thanks for this nice software ! :) I discovered it very recently.

In my setup, I have an external TURN/STUN server, and I prefere to use TLS instead of non encrypted traffic. But it seems it cannot be configured in screego.

https://github.com/screego/server/blob/master/ws/room.go#L49

I think it miss two things:

• Ability to use a domain name instead of an IP address
• Ability to configure that "turn" and "stun" strings to be "turns" and "stuns"

Are you interested in that / any better way to do that ? If you are interested I can try to make a pull request