Issue #1821854 by tim.plunkett, effulgentsia, larowlan: Convert image effects into plugins.

...dules/config/lib/Drupal/config/Tests/ConfigSchemaTest.php

core/modules/image/config/image.style.large.yml

core/modules/image/config/image.style.medium.yml

core/modules/image/config/image.style.thumbnail.yml

core/modules/image/config/schema/image.schema.yml

core/modules/image/image.admin.inc

core/modules/image/image.api.php

core/modules/image/image.effects.inc

core/modules/image/image.install

core/modules/image/image.module

core/modules/image/image.routing.yml

core/modules/image/image.services.yml

...modules/image/lib/Drupal/image/Annotation/ImageEffect.php

...age/lib/Drupal/image/ConfigurableImageEffectInterface.php

...odules/image/lib/Drupal/image/Form/ImageEffectAddForm.php

...les/image/lib/Drupal/image/Form/ImageEffectDeleteForm.php

...dules/image/lib/Drupal/image/Form/ImageEffectEditForm.php

...dules/image/lib/Drupal/image/Form/ImageEffectFormBase.php

core/modules/image/lib/Drupal/image/ImageEffectBag.php

core/modules/image/lib/Drupal/image/ImageEffectBase.php