Changes to Create Upload Targets

added the optional property detail/items/ctx to the response with the 422 status

added the optional property detail/items/input to the response with the 422 status

added the required property max_single_put_bytes to the response with the 200 status

added the required property multipart_available to the response with the 200 status

added the optional property files/items/upload_id to the response with the 200 status

added the required property max_upload_bytes to the response with the 200 status

endpoint added