[clang] [clang][ssaf] Add JSONFormat support for WPASuite (PR #187403)

[Balázs Benics via cfe-commits]

https://github.com/steakhal requested changes to this pull request.

First round of review. I didn't finish. I'll need to dive into the dark magic of the custom registry to conclude my review. There should be some stuff to keep you busy until that.

https://github.com/llvm/llvm-project/pull/187403