Add rel="noreferrer noopener" when setting 'open in new tab' option

[JeroenSormani]

Issue Overview

I noticed that the 'Open in a new tab' option has been (re-)added.
Glad to see its back, now the additional rel="noreferrer noopener" attribute should be added for security; https://www.jitbit.com/alexblog/256-targetblank---the-most-underestimated-vulnerability-ever/

It is already part of WP Core; https://core.trac.wordpress.org/ticket/36809
Has also been mentioned in the big convo here; #4583 but is yet to be implemented.

Expected Behavior

Any link that uses the 'Open in a new window' option should automatically get the rel="noreferrer noopener" attribute added too.

Current Behavior

No rel attribute is added/available.