Depreciate ContentEnricherService from Automation and old document's JSON marshaller

Depreciate org.nuxeo.ecm.automation.jaxrs.io.documents.JsonDocumentWriter This JAX-RS marshaller was migrated to DocumentModelJsonWriter. To use it in JAX-RS, use JsonCoreIODelegate to forward JAX-RS marshalling to core io. To use it your code, please refer to MarshallerRegistry service or use MarshallerHelper. Depreciate all automation ContentEnrichers and the ContentEnricherService The JSON marshalling was migrated to nuxeo-core-io. An enricher system is also available. See org.nuxeo.ecm.core.io.marshallers.json.enrichers.BreadcrumbJsonEnricher for an example. To migrate an existing enricher, keep the marshalling code and use it in class implementing AbstractJsonEnricher<DocumentModel> (the use of contextual parameters is a bit different but compatible / you have to manage the enricher's parameters yourself). Don't forget to contribute to service org.nuxeo.ecm.core.io.registry.MarshallerRegistry to register your enricher.