Provides a render element for a pager.
The pager must be initialized with a call to pager_default_initialize() in order to render properly. When used with database queries, this is performed for you when you extend a select query with \Drupal\Core\Database\Query\PagerSelectExtender.
Properties:
#element: (optional, int) The pager ID, to distinguish between multiple pagers on the same page (defaults to 0).
#parameters: (optional) An associative array of query string parameters to append to the