Issue #3425144 by alorenc, claudiu.cristea: Settings UI

config/schema/rdf_sync.schema.yml

rdf_sync.links.menu.yml

rdf_sync.module

rdf_sync.routing.yml

src/Form/Alter/AbstractFormAlter.php

src/Form/Alter/BundleEntityFormAlter.php

src/Form/Alter/FieldConfigFormAlter.php

src/Form/Alter/FormAlterInterface.php

src/Form/SettingsForm.php

tests/src/Functional/RdfEntityConfigFormTest.php

tests/src/Functional/RdfFieldConfigFormTest.php

tests/src/Kernel/RdfSyncSettingsFormTest.php