Changes to Listar cuentas contables

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

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

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