At least Psi and Spectrum do, and I think every major server does. I haven't chosen my clients by support of those XEPs and all of them happen to support at least one, so I suspect that at least one of them will be pretty commonly implemented these days.

In fact, to just one-time migrate your roster you don't even need any of them - you just download the roster from one account and push it to another. There are plenty of tools to do that on the Web. XEPs make it easy to keep them synchronized, or to "push" roster from one account to another without having to log in into new account with the tool you want to use.