New Sniff: target="_blank"

## What problem would the enhancement address for VIP?
There's a potential issue with using `target="_blank"` and not using `rel="noopener"` or `rel="noreferrer"`.
See: https://web.dev/external-anchors-use-rel-noopener/

## Describe the solution you'd like

Maybe warn about this if we see `noopener` or `noreferrer` present?

## What code should be reported as a violation?

`Link`

## What code should *not* be reported as a violation?

`Link`

OR

`Link`

Start by reviewing the repository's existing sniffs and PHP_CodeSniffer rules for how anchor attributes are inspected. Confirm that an with target="_blank" is reported unless rel contains noopener or noreferrer, and that the two compliant examples are accepted.

Written by the indexing model from the issue text.