Native macOS/iOS mDNS stack support (NWListener)

[amydevs]

Specification

There are common API's for local network service discovery on macOS and iOS. This could be used instead of directly making calls to macOS's mDNSResponder

Additional context

New API: https://developer.apple.com/documentation/network/nwlistener/service
Deprecated API: https://developer.apple.com/documentation/foundation/nsnetservice

Tasks

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