#3490350 New API for icon management

kind: filename_presence
to:
  api_key: icon_packs
  file_glob: '*.icons.yml'
kind: attribute_usage
to:
  - \Drupal\Core\Theme\Icon\Attribute\IconExtractor
api_key: icon_extractor
target_kind: class
to: \Drupal\Core\Render\Element\Icon
to: \Drupal\Core\Theme\Icon\IconCollector
to: \Drupal\Core\Theme\Icon\IconDefinition
to: \Drupal\Core\Theme\Icon\IconDefinitionInterface
to: \Drupal\Core\Theme\Icon\IconExtractorBase
to: \Drupal\Core\Theme\Icon\IconExtractorInterface
to: \Drupal\Core\Theme\Icon\IconExtractorWithFinder
to: \Drupal\Core\Theme\Icon\IconExtractorWithFinderInterface
to: \Drupal\Core\Theme\Icon\Plugin\IconPackManager
to: \Drupal\Core\Theme\Icon\Plugin\IconPackManagerInterface