[NEW FEATURE] Mdns support of websocket native Pipe

[nicolas-rabault]

In Native example Pipe is the service dealing with the WebSocket and allowing other things to interact with the native luos_engine network.
For now this pipe create a WS (websocket) server and relay all input and output of the websocket to the Gate or Inspector service. This way Pyluos can send information for the Gate or Inspector trough this WS pipe.
Pyluos is able to list the compatible interfaces available on the system. For now we are able to list available serial interface, but we should be able to make it also with this WS Pipe.
To do that we should add an Mdns(also known as Bonjour) support on the native WS Pipe, allowing the WS Pipe to declare itself on the network to be "discoverable".

[nicolas-rabault]

This Lib could make it : https://github.com/mjansson/mdns
We still have to benchmark it.

[nicolas-rabault]

We already had WS+MDNS support on ESP32, and that was working (see #294)
I also found back a discovery function on pyluos about it : https://github.com/Luos-io/Pyluos/blob/master/pyluos/tools/wifi_gate.py#L18-L33