Implement prefer IPv6 option for the client

[Stennsen]

This implements #184 I tested it manually behind my ISP's Dual Stack lite with an external Server supporting both ipv4 and ipv6. Both A and AAAA registries were added for the tested domain.

[Stennsen]

@fernvenue sry it took that long. I hope you could also test it :)

[Stennsen]

there are some clippy warnings, where did not even touch the code, shall I also fix them? clippy --fix did also not automatically fix them.

[ShiromMakkad]

My pr touched the lines that clippy is complaining about, so I fixed them. Personally, I prefer it that way or in a separate cr, but I guess it's really up to the conventions that @rapiz1 wants.

[fernvenue]

Hi @Stennsen, I just tested it on my devices, it works perfectly great :)