Issue #3455435 by roderik: Change configuration structure for CE display 'components'

config/schema/custom_elements.schema.yml

...stom_elements.entity_ce_display.media.gallery.default.yml

...custom_elements.entity_ce_display.media.image.default.yml

...ll/custom_elements.entity_ce_display.media.image.full.yml

...stom_elements.entity_ce_display.media.twitter.default.yml

...custom_elements.entity_ce_display.media.video.default.yml

..._elements.entity_ce_display.paragraph.gallery.default.yml

...om_elements.entity_ce_display.paragraph.image.default.yml

...tom_elements.entity_ce_display.paragraph.link.default.yml

...om_elements.entity_ce_display.paragraph.quote.default.yml

...tom_elements.entity_ce_display.paragraph.text.default.yml

..._elements.entity_ce_display.paragraph.twitter.default.yml

...om_elements.entity_ce_display.paragraph.video.default.yml

...ments_ui/src/Form/EntityCustomElementsDisplayEditForm.php

src/CustomElementGenerator.php

src/Entity/EntityCeDisplay.php

src/Entity/EntityCeDisplayInterface.php

tests/src/Functional/CustomElementsRenderMarkupTest.php

tests/src/Kernel/EntityCeDisplayTest.php

tests/src/Kernel/EntityReferenceCeFieldFormatterTest.php