Implement BIP 0155 - Tor v3

[MorningLightMountain713]

https://support.torproject.org/onionservices/v2-deprecation/

BIP:

https://github.com/bitcoin/bips/blob/master/bip-0155.mediawiki

Implementation:

bitcoin/bitcoin#19954

Currently Fluxd still implements the deprecated v2 onion addresses. This means that no nodes can advertise themselves with onion addresses.

This is quite limiting as a large chunk of flux nodes have no inbound connections due to nat. If fluxd supported v3, we could advertise every fluxnode with a v3 onion address and therefore allow inbound connections.

This wouldn't be that much work as it's just a matter of porting the code over from Bitcoin.