Non-existing domain IPv6 domains in gen_tcp

[flexagoon]

Describe the bug
When trying to connect to a domain that only has an IPv6 address with gen_tcp, it throws an nxdomain error unless you pass the :inet6 option

To Reproduce

1. Set up a domain that only has an IPv6 (AAAA) record
2. Try to connect to it with gen_tcp:connect

Expected behavior
The domain gets resolved and connects

Affected versions
Erlang/OTP 27

Additional context
The issue was originally reported in the Elixir Redix library, but it was closed since it's an upstream OTP issue:

whatyouhide/redix#222

[ruslandoga]

Might be related: #8548

[RaimoNiskanen]

I'd say it is very much related to #8548.
A Happy Eyeballs implementation is missing in Erlang/OTP.

Now it works as designed. inet | inet6 sets the protocol to use for both the DNS lookup and for the TCP connection. No fallback is attempted.

But Happy Eyeballs (RFC 8305) can of course be implemented, and I'd say it should be added as a support library in Kernel/Stdlib, and used from gen_tcp and siblings.