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

[Maksim Levental via llvm-commits]

makslevental wrote:

Current fail is due to some unrelated lldb python thing? https://github.com/llvm/llvm-project/pulls?q=is%3Apr+is%3Aopen+lldb

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