Changes to Listar órdenes de compra

the response property data/items/formatted_order_number became nullable for the status 200

added the non-success response with the status 503

added the optional property error/details/items/metadata to the response with the 400 status

added the optional property error/details/items/metadata to the response with the 401 status

added the optional property error/details/items/metadata to the response with the 403 status

added the optional property error/details/items/metadata to the response with the 429 status

added the optional property error/details/items/metadata to the response with the 500 status

response property data/items/formatted_order_number list-of-types was narrowed by removing types null from media type application/json of response 200

added the required property data/items/tags to the response with the 200 status