I found some issues in github repo here but cannot find any documentation for pagination for categories. Is it available?
That is more than an actual issue but a pull request with as yet unmerged code.
Since it is not merged, there will be documentation to read yet on master.
But there is a short doc addition in the README on the PR
If you need something more specific than that as documentation, make a request on the PR with a comment or make a new issue that someone can do after the in progress change is in.