Run TLS server in case certificate and key path are passed as parameters

[diogob]

Add configuration type for websockets server so we can take TLS certificate config.

I'm opening as draft for early feedback, since I still have not tested it with a secure websocket client (the https connection is surely working).

[agentm]

Very cool! I like how straightforward this is to read.

[diogob]

I've done some testing with the JS example app and everything seems to work as expected over wss