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

[Mehdi Amini via llvm-commits]

joker-eph wrote:

You don't have to use a venv, you can install the pip requirements for the current user I believe (this is what I have setup locally)

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