Posture check: GCP Storage buckets are publicly accessible to all users
Query: ```config from cloud.resource where cloud.type = 'gcp' AND api.name = 'gcloud-storage-buckets-list' AND json.rule = iamConfiguration.publicAccessPrevention does not equal ignore case "enforced" and iam.bindings[*] size greater than 0 and iam.bindings[*].members[*] any equal allUsers```