[llvm] [mlir] [mlir python] Port in-tree dialects to nanobind. (PR #119924)

[Peter Hawkins via llvm-commits]

hawkinsp wrote:

> Overall looks good, I think we can do the following to avoid more of the nanobind warnings (else it just results in too much logging)
...

Done

https://github.com/llvm/llvm-project/pull/119924