Starts a tcp server on the listen port and hands connections off
to internal http or https servers (depdending on connection type).

Upgrade requests from both servers are handled by a websocket
server.

The https server is enabled when either a secure websocket address
is listened to explicitly, or when a TLS certificate is provisioned
by another libp2p component, likely `@libp2p/auto-tls`.

This means we don't need to add another port mapping for the https
server since we run http and https over the same port.