Issue #3453049: Improve field group support for custom fields

.../tests/src/Traits/SchemaDotOrgAdditionalTypeTestTrait.php

.../schemadotorg_field_group/schemadotorg_field_group.module

..._group/src/SchemaDotOrgFieldGroupEntityDisplayBuilder.php

...c/SchemaDotOrgFieldGroupEntityDisplayBuilderInterface.php

.../SchemaDotOrgFieldGroupEntityDisplayBuilderKernelTest.php

...org_field_validation/schemadotorg_field_validation.module

...s/schemadotorg_jsonapi/src/SchemaDotOrgJsonApiManager.php

modules/schemadotorg_role/schemadotorg_role.services.yml

...es/schemadotorg_role/src/SchemaDotOrgRoleFieldManager.php

.../schemadotorg_starterkit_test.schemadotorg_starterkit.yml

...ot/core.entity_form_display.node.custom_thing.default.yml

.../snapshot/core.entity_form_display.node.event.default.yml

...snapshot/core.entity_form_display.node.person.default.yml

...ot/core.entity_view_display.node.custom_thing.default.yml

...snapshot/core.entity_view_display.node.person.default.yml

.../snapshot/core.entity_view_display.node.person.teaser.yml

.../config/snapshot/field.field.node.custom_thing.custom.yml

...dotorg_translation/src/SchemaDotOrgTranslationManager.php

phpstan.neon

src/SchemaDotOrgEntityDisplayBuilder.php