Create a remote folder

Create one folder at the provider directly under a browse location, then export into it with POST /connectors/v1/transfer. Name the parent with the same site, container, and parent fields browse accepts (for Clio and Smokeball, a matter root is the browse_ref the matter returned). A folder of the same name already under the parent is returned with 200 instead of a duplicate; a new folder returns 201. Smokeball creates folders asynchronously: when the new folder is not listed yet the response is 202 with code folder_creation_pending and no folder, and repeating the same request returns it without creating another. Returns 403 provider_scope_insufficient when the connection was granted read access only; reconnect with write access.