Allow the moderation_state field to be used as a contextual filter.

Jeff Cardwell → made their first commit to this issue’s fork.

Here is a first pass at a contextual filter. I needed to create it for a project, so here's the code I used.

Merge Request Applied and tested successfully on Drupal 10.1.x.

Before Patch:

After Patch:

Here is a patch version of the changes in #9 just in case anyone else needs it. :) Also I don't think it says anywhere (or I could have just missed it) but the argument needs to be given with a dash between the workflow name and the moderation state name (e.g. editorial-published).