Use callable resolver in batch API to allow callbacks in service notation

[escobar-ui]

Problem/Motivation
The motivation is the same as this issue for the Drupal Core batch API: https://www.drupal.org/project/drupal/issues/3401873.
The batch API takes callbacks, but these have to be functions or static methods on classes.

If we use the callable resolver, we can also allow callbacks in service notation, that is, in the form my_service:methodName.

Proposed resolution
Changes similar to those made to core/includes/batch.inc in this merge request could be implemented in function _drush_batch_worker() on batch.inc