feat: add support for 'domainname' option in container create

[swagatbora90]

Adds support for --domainname in container create and run.

A domainname fied has been added to the OCI spec and runc has added support for it.

This field should set mainly set the NIS domain name of the container. Though, docker is currently using the domainname option to also set the FQDN in /etc/hosts. I have tried to preserve the same behavior, since some users may choose to pass a unqualified hostname and the domain name separately, instead of passing the full FQDN in the hostname.

Testing:

dev-dsk-sbora-2c-038007b3 % sudo nerdctl run -it --hostname myhost --domainname example.com ubuntu  domainname
example.com

(25-02-14 19:49:14) <0> [~/nerdctl]  
dev-dsk-sbora-2c-038007b3 % sudo nerdctl run -it --hostname myhost --domainname example.com ubuntu hostname
myhost

(25-02-14 19:49:19) <0> [~/nerdctl]  
dev-dsk-sbora-2c-038007b3 % sudo nerdctl run -it --hostname myhost --domainname example.com ubuntu hostname -f
myhost.example.com

(25-02-14 19:49:22) <0> [~/nerdctl]  
dev-dsk-sbora-2c-038007b3 % sudo nerdctl run -it --hostname myhost --domainname example.com ubuntu hostname --nis
example.com

Closes: #1772

[AkihiroSuda]

Thanks