Add network-discovery support

[cmaglie]

Network discovery tool: https://github.com/arduino/mdns-discovery

This should allow OTA and is required to implement #69

[rtek1000]

Hello guys, I don't want to be too boring, but it will be difficult for people to test this IDE 2.0 if they don't have the network port.

Do you have any expectations of being able to add this functionality?

Do you have any priority of adding this network port?

Thank you.

[kmorris1077]

Not having the network port capability is a total deal breaker for many of us with esp32s in field installations who want to use the 2.0 IDE.

[ubidefeo]

@kmorris1077
we are in the process of closing our RFC for pluggable discovery.
At that point it would be up to platform implementers to write their discovery layer

[StarMiner99]

im also not using the arduino 2 ide because i cant programm my esp-01s without cables and an ftdi adapter its to much work to connect it every time.