Tor integration

[romainbsl]

• uses https://github.com/ACINQ/tor-mobile-kmp (publish on Bintray)
• needs Updated Socket facade so that it is now possible to start TLS *after* the socket has opened. lightning-kmp#190 to be merged

This PR add the Tor integration for Phoenix iOS.

• Manage the Tor connection lifecycle when Tor is enable in the configuration, as any other connectivity there is a connection loop that retry to connect on an increasing delay (min 500ms - max 8s).
• Add Tor connection state on the HomeView
• Add Tor version / network state info TorConfigurationView
• If Tor is enabled, Electrum and Peer wait that both Internet and Tor are online before getting the proper socket builder and connecting
• Initialize ElectrumClient and Peer with a null socket builder, prevent them to connect through the wrong pipeline
• Force Electrum to connect through SSL (didn't see anything specifying enabling / disabling TLS on Android)
• Finally, this doesn't affect HTTP API consumer (bitcoin rates / wallet params)