Adicionar Documentação de rota de listagem de pets publica

[devlefel]

Describe the feature Adicionar Documentação de rota de listagem de pets PUBLICA

Adicionar a documentação no swagger na rota `GET /api/pets/. O Guia para adicionar a documentacao do Swagger está no guia de contribuicao na raiz do projeto

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Use Case

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Implementation Details

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