List authors

curl --request GET \
  --url https://api.marblecms.com/v1/authors \
  --header 'Authorization: Bearer <token>'

{
  "authors": [
    {
      "id": "clx123abc",
      "name": "John Doe",
      "image": "https://cdn.example.com/avatar.jpg",
      "slug": "john-doe",
      "bio": "Technical writer and developer",
      "role": "Editor",
      "socials": [
        {
          "url": "https://twitter.com/johndoe",
          "platform": "twitter"
        }
      ],
      "count": {
        "posts": 12
      }
    }
  ],
  "pagination": {
    "limit": 10,
    "currentPage": 1,
    "nextPage": 2,
    "previousPage": null,
    "totalPages": 5,
    "totalItems": 42
  }
}