WIP: [fanbox] fix list indices error

[Jeremy-Hibiki]

close #5949

[Jeremy-Hibiki]

the api now returns { "body": [ ... ] }, without a nested "list" field

[Jeremy-Hibiki]

I found currently the post.listCreator endpoint returns a list inside body field, the others still composed by items and nextUrl fields.

With the change, the post.listCreator endpoint loose the ability to go next page. Maybe fanbox will update other APIs

[ZenoArrows]

There's a new end point for pagination called post.paginateCreator that will give you a list of post.listCreator URLs that you can iterate over.

I've opened a PR that implements that endpoint: #5956