[llvm] [mlir] [mlir python] Add nanobind support for standalone dialects. (PR #117922)

[Maksim Levental via llvm-commits]

makslevental wrote:

Looks like the pip install deps are here https://github.com/llvm/llvm-zorg/blob/fab27e270d1a3754c98175d780bc4793e13fefc5/buildbot/mlir-nvidia/Dockerfile#L53 so that needs a PR but I don't know if that triggers a rebuild of the container? For a moment I'm gonna revert.

https://github.com/llvm/llvm-project/pull/117922