Retorna uma aula

curl --request GET \
  --url https://memberkit.com.br/api/v1/courses/{course_id}/lessons/{id}

{
  "id": 123,
  "slug": "<string>",
  "position": 123,
  "title": "<string>",
  "content": "<string>",
  "created_at": "2023-11-07T05:31:56Z",
  "updated_at": "2023-11-07T05:31:56Z",
  "video": {
    "id": 123,
    "uid": "<string>",
    "source": "<string>",
    "duration": 123,
    "image": "<string>"
  },
  "files": [
    {
      "id": 123,
      "url": "<string>",
      "byte_size": 123,
      "content_type": "<string>",
      "filename": "<string>",
      "created_at": "2023-11-07T05:31:56Z"
    }
  ]
}