Get user following list | 获取用户关注列表

{
    "code": 20000,
    "data": {
        "list": [
            {
                "avatar": "https://example.com/avatar.jpg",
                "followed_at": "2024-01-20 12:00:00",
                "is_following": true,
                "is_mutual": false,
                "signature": "这是个性签名",
                "user_id": 123,
                "username": "username"
            }
        ],
        "page": 1,
        "page_size": 20,
        "total": 50
    },
    "err_code": "string",
    "msg": null
}