Enhancement: Use zeroconf for configuration

[rlippmann]

Describe the solution you'd like S40 thermostats appear to advertise themselves via zeroconf as http services. It would be nice to use that for the config flow.

Details of your HVAC system (e.g heat pump, gas furnace, boiler, AC, external ventilation)

Additional context It appears to expose the service via: serial#_1._icomfort4._res._lii._http._tcp.local