Allowlist a domain for lint/a11y/noBlankTarget

[GRA0007]

We have a few sites that we manage, and currently any links between them we manually disable the lint/a11y/noBlankTarget rule so our analytics can track clicks between them. We're not worried about security given that all the sites are ours.

This results in about 100 or so links with a manual ignore comment. I'd like to propose a config option that allowlists certain domains to allow target="_blank" without noreferrer set.

Something like this would be great:

{
  "noBlankTarget": {
    "options": {
      "allowDomains": ["ourdomain.com", "oursubdomain.hostingprovider.net"]
    }
  }
}

I believe this aligns with the ethos of this rule, as it's designed to prevent security issues with 3rd party sites, but managing multiple sites and linking between them is a common use-case.

[dyc3]

Seems reasonable to me. Should be reasonably easy for a new contributor, could be a new good first issue.