Generate openapi spec from appdaora

[dutradda]

Info: https://swagger.io/docs/specification/about/ https://github.com/OAI/OpenAPI-Specification/blob/master/versions/3.0.2.md

Acceptance Criteria:

• Must use the spec.py module as inspiration, so the module can be refactored.
• The informations to build the openapi spec must be passed on @path decorator and appdaora function.
• The actual informations must be necessary to generate the openapi spec. The missing infos must be infered and/or has a default value.