Collect references and space contexts for saved objects.
POST /api/spaces/_get_shareable_references
curl \ --request POST 'https://localhost:5601/api/spaces/_get_shareable_references' \ --header "Authorization: $API_KEY" \ --header "Content-Type: application/json" \ --header "kbn-xsrf: true" \ --data '{"objects":[{"id":"string","type":"string"}]}'