Add migrate:tree in Drush

[gitressa]

Original issue at drupal.org/project/migrate_tools: Add migrate:tree in Drush.

Is your feature request related to a problem? Please describe. It's great that the Migrate Tools commands are included in Drush since Drush 10.4.

As far as I can tell, the only missing command is migrate:tree. I haven't done enough migrations to see how useful it is, but it looks like it could help get a better picture of a migration.

So perhaps it could be considered to also add it to Drush, if it's not too much hassle?

Describe the solution you'd like Add migrate:tree in Drush.