All classes that implement OptionsProviderInterface in Zircon Profile 8.0

class \Drupal\Core\Field\Plugin\Field\FieldType\BooleanItem implements OptionsProviderInterface
class \Drupal\Core\Field\Plugin\Field\FieldType\EntityReferenceItem implements PreconfiguredFieldUiOptionsInterface, OptionsProviderInterface
class \Drupal\entity_reference\ConfigurableEntityReferenceItem
class \Drupal\file\Plugin\Field\FieldType\FileItem
class \Drupal\filter\Plugin\DataType\FilterFormat implements OptionsProviderInterface
class \Drupal\image\Plugin\Field\FieldType\ImageItem
class \Drupal\options\Plugin\Field\FieldType\ListFloatItem
class \Drupal\options\Plugin\Field\FieldType\ListIntegerItem
class \Drupal\options\Plugin\Field\FieldType\ListItemBase implements OptionsProviderInterface uses AllowedTagsXssTrait
class \Drupal\options\Plugin\Field\FieldType\ListStringItem

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