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

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``````````diff
--- __init__.py	2025-09-20 03:50:18.000000 +0000
+++ __init__.py	2025-09-20 03:52:29.208388 +0000
@@ -146,10 +146,11 @@
         module_name = f"_site_initialize_{i}"
         if not process_initializer_module(module_name):
             break
 
     ir._Context = ir.Context
+
     class Context(ir._Context):
         def __init__(
             self, load_on_create_dialects=None, thread_pool=None, *args, **kwargs
         ):
             super().__init__(*args, **kwargs)

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