Ability to set 301 status code when using "Redirect all domains to" feature

[khromov]

Is your feature request related to a problem? Please describe.
The problem is that all redirects currently respond with a 302, which means "temporary redirect". This gives the wrong impression to search engines. While 302 is a good default, it should be possible to set the code to 301 "permanent redirect"

Describe the solution you'd like
A dropdown to select either 301 or 302 redirects.

Describe alternatives you've considered
Manual config change perhaps, but it's not very user friendly.

Additional context
N/A