Implement Preview Section in Augmentor Configuration Form

Patch attached.

This is amazing. Thank you.
Works as expected.

@eleonel

When I use Text Generation(NLP Cloud) for this. I get 500 error.

The db log says something like this:

LogicException: The database connection is not serializable. This probably means you are serializing an object that has an indirect reference to the database connection. Adjust your code so that is not necessary. Alternatively, look at DependencySerializationTrait as a temporary solution. in Drupal\Core\Database\Connection->__sleep() (line 1712 of /code/web/core/lib/Drupal/Core/Database/Connection.php).

Attached many UI improvements to make the preview section similar to the way "Views preview" works.

Merged.

Automatically closed - issue fixed for 2 weeks with no activity.