Allow choosing IPv4 or IPv6 in client configuration

[jwfang]

Is your feature request related to a problem? Please describe.
My VPS have shit connectivity/route via IPv4, but much better IPv6. I want to finer control the IP version used.
BTW: I want to use both versions, IPv6 as primary and IPv4 as backup.

Describe the solution you'd like
-4 and -6 option as most network tools do today.

Describe alternatives you've considered
Different DNS record for different IP version, not very elegant and cause management burden.

[tobyxdd]

You can use IP instead of domain as server address

[netsupcloud]

this is outbound configuration of xray for selecting ipv4 or ipv6 as outbound in server side:

"outbounds": [
{
"tag": "IPv4_out",
"protocol": "freedom",
"settings": {
"domainStrategy": "UseIPv4"
}

need something like this for hysteria