Issue #3526214 by sanduhrs: Add bundles, fields and mapper to webhook entity

...ok/config/install/system.action.webhook_delete_action.yml

modules/webhook/config/install/webhook.mappings.webhook.yml

...s/webhook/config/install/webhook.webhook_type.webhook.yml

modules/webhook/config/schema/webhook.entity_type.schema.yml

modules/webhook/config/schema/webhook.schema.yml

.../webhook/src/Controller/WebhookAutocompleteController.php

modules/webhook/src/Entity/Webhook.php

modules/webhook/src/Entity/WebhookType.php

modules/webhook/src/EventSubscriber/WebhookSubscriber.php

modules/webhook/src/Form/MappingDeleteConfirmForm.php

modules/webhook/src/Form/MappingForm.php

modules/webhook/src/Form/WebhookForm.php

modules/webhook/src/Form/WebhookTypeForm.php

modules/webhook/src/Routing/WebhookHtmlRouteProvider.php

modules/webhook/src/WebhookInterface.php

modules/webhook/src/WebhookListBuilder.php

modules/webhook/src/WebhookTypeListBuilder.php

modules/webhook/templates/webhook.html.twig

modules/webhook/webhook.links.action.yml

modules/webhook/webhook.links.contextual.yml