[llvm] [mlir] [MLIR][Python] reland (narrower) type stub generation (PR #157930)

[Mehdi Amini via llvm-commits]

joker-eph wrote:

I don't follow:
1) there is no error here, so nothing to diagnose, I expect it to stay quiet.
2) my comment was describing the need for a version check of the dependency in **cmake**: that means that running cmake I would expect a `message(FATAL_ERROR "Nanobind is too old, minimum version should be xx.yy")`.

https://github.com/llvm/llvm-project/pull/157930