[feature request] allow admins to provide reason why an item needs updates before being approved

[iSCJT]

Is your feature request related to a problem? Please describe. Currently an admin can 'reject' a post but there is no way other than exchanging emails to tell them what needs to be changed or improved before it will be approved.

Describe the solution you'd like Add a field to the how to and research objects that stores moderation comments, if a post is rejected then the admin can add comments, these should be displayed when viewing the how to / research article so that the user can make amendments before resubmitting. The comments should be hidden once the post is approved.

Describe alternatives you've considered Alternative is for the admin and user to have backwards and forwards emails.

Additional context Add any other context or screenshots about the feature request here.