Support "Clone" functionality

Problem/Motivation

Would be nice if this module supported Entity Clone, in addition to (or instead of "Replicate" and "Field Tools" approach).

When using the Entity Clone module, the "Clone" option does appear in the dropbutton of each Site Setting.

When I click "clone" to duplicate a site_setting_entity_type, I'm first lead to a page to rename the label, but when I proceed I get the following error:

The website encountered an unexpected error. Please try again later.

Symfony\Component\Routing\Exception\RouteNotFoundException: Route "entity.site_setting_entity_type.canonical" does not exist. in Drupal\Core\Routing\RouteProvider->getRouteByName() (line 206 of core/lib/Drupal/Core/Routing/RouteProvider.php).
Drupal\Core\Routing\UrlGenerator->getRoute('entity.site_setting_entity_type.canonical') (Line: 270)
Drupal\Core\Routing\UrlGenerator->generateFromRoute('entity.site_setting_entity_type.canonical', Array, Array, 1) (Line: 105)
Drupal\Core\Render\MetadataBubblingUrlGenerator->generateFromRoute('entity.site_setting_entity_type.canonical', Array, Array, ) (Line: 765)
Drupal\Core\Url->toString() (Line: 133)
Drupal\Core\Form\FormSubmitter->redirectForm(Object) (Line: 80)
Drupal\Core\Form\FormSubmitter->doSubmitForm(Array, Object) (Line: 595)
Drupal\Core\Form\FormBuilder->processForm('entity_clone_form', Array, Object) (Line: 323)
Drupal\Core\Form\FormBuilder->buildForm(Object, Object) (Line: 73)
Drupal\Core\Controller\FormController->getContentResult(Object, Object)
call_user_func_array(Array, Array) (Line: 123)
Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber\{closure}() (Line: 580)
Drupal\Core\Render\Renderer->executeInRenderContext(Object, Object) (Line: 124)
Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->wrapControllerExecutionInRenderContext(Array, Array) (Line: 97)
Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber\{closure}() (Line: 163)
Symfony\Component\HttpKernel\HttpKernel->handleRaw(Object, 1) (Line: 74)
Symfony\Component\HttpKernel\HttpKernel->handle(Object, 1, 1) (Line: 58)
Drupal\Core\StackMiddleware\Session->handle(Object, 1, 1) (Line: 48)
Drupal\Core\StackMiddleware\KernelPreHandle->handle(Object, 1, 1) (Line: 270)
Drupal\shield\ShieldMiddleware->bypass(Object, 1, 1) (Line: 137)
Drupal\shield\ShieldMiddleware->handle(Object, 1, 1) (Line: 48)
Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle(Object, 1, 1) (Line: 51)
Drupal\Core\StackMiddleware\NegotiationMiddleware->handle(Object, 1, 1) (Line: 51)
Drupal\Core\StackMiddleware\StackedHttpKernel->handle(Object, 1, 1) (Line: 681)
Drupal\Core\DrupalKernel->handle(Object) (Line: 19)

Interestingly enough the entity is cloned with the new label I provided, but not the field or field config.

Steps to reproduce

1. Install site settings and entity clone.
2. Create a "Facebook" Site Settings Entity, in group "Social Links" with a field_link.
3. Navigate to https://uofmncehd.ddev.site/entity_clone/site_setting_entity_type/facebo...
4. Specify a new label "Twitter".

Proposed resolution

Remaining tasks

User interface changes

API changes

Data model changes