Update dialer to prefer IPv6 #600
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Fix #1115
This PR introduces a new dialer function,
preferIPV6Dialer, and a helper function,tcpAddrPrefer6IPv4Fallback. ThepreferIPV6Dialerfunction prefers IPv6 addresses when establishing network connections. If it fails to connect via IPv6, it falls back to the original network (likely IPv4). ThetcpAddrPrefer6IPv4Fallbackfunction attempts to resolve the hostport string into an IPv6 address, and if it fails, it falls back to IPv4.