Improve in OPEN_API Vallidations

[JailtonAraujo]

Currently, when using Netuno's OPEN_API validations, we do not have an accurate response to violations.

{
    "tags":[
      "serviços de produto"
    ],
    "summary": "Detalhe do Produto",
    "description": "É obtido todos os campos de detalhe do produto especificado.",
    "type": "object",
    "properties": {
      "uid": {
        "type": "uid"
      }
    },
    "required": [
      "uid"
    ]
}

The above example shows the validation of a uid field which requires the correct format, otherwise it returns an error with status 400.
Furthermore could return a message more friendly.