Remove role configurations on uninstall

Problem/Motivation

When I uninstall the module and try to install it again I get the following exception:

Drupal\Core\Config\PreExistingConfigException: Configuration objects (single_role.settings) provided by role already exist in active configuration in /var/www/draft/docroot/core/lib/Drupal/Core/Config/PreExistingConfigException.php:65

Proposed resolution

Implement a hook_uninstall() in modules install file and remove active configuration
\Drupal::configFactory()->getEditable('single_role.settings')->delete();