Specify and implement string encoding/decoding for tor_rtcompat::general::SocketAddr
We want to allow all of:
unix:/pathtcp:127.0.0.1:9999tcp:[::1]:9999127.0.0.1:9999[::1]:9999
We want to allow all of:
unix:/pathtcp:127.0.0.1:9999tcp:[::1]:9999127.0.0.1:9999[::1]:9999