[Feature]: Port forwarding for IPv6

[schmensch]

Preflight checks

• I have searched existing issues and this feature has not already been requested.
• This request is for the Windscribe desktop app (not the browser extension, mobile app, or web dashboard).
• I understand that incomplete requests may be closed without further discussion.

Problem or motivation

Ephemeral port forwards are currently supported for Wireguard and OpenVPN connections with the desktop / CLI / Android apps.

On certain locations, Wireguard is now Dual Stack through the app, but ephemeral port forwards currently only work for IPv4.

It would be great if ephemeral port forwards would also support IPv6 on dual stack enabled servers, as this would e. g. improve connectivity for P2P applications when connecting with IPv6 only clients or clients with DS-Lite.

Proposed solution

Ephemeral port forwarding not only works for IPv4, but Dual Stack. It should also allow port forwards for IPv6.

Alternatives considered

IPv4 only port forwards (current implementation): Falls short with IPv6 clients.
IPv6 / IPv4 separate forwards: Too much effort, most users would expect both to work with the same forward. In theory possible though.

Which platforms should this apply to?

All platforms

Additional context

No response