[MLIR][Python] add mypy tests

[makslevental]

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⚠️ Python code formatter, darker found issues in your code. ⚠️

You can test this locally with the following command:

darker --check --diff -r origin/main...HEAD mlir/python/mlir/__init__.py mlir/python/mlir/dialects/__init__.py mlir/test/python/bindings_type_stubs.py mlir/test/lit.cfg.py mlir/test/python/dialects/affine.py mlir/test/python/dialects/amdgpu.py mlir/test/python/dialects/arith_dialect.py mlir/test/python/dialects/arith_llvm.py mlir/test/python/dialects/async_dialect.py mlir/test/python/dialects/builtin.py mlir/test/python/dialects/cf.py mlir/test/python/dialects/complex_dialect.py mlir/test/python/dialects/emitc_dialect.py mlir/test/python/dialects/func.py mlir/test/python/dialects/gpu/dialect.py mlir/test/python/dialects/gpu/module-to-binary-nvvm.py mlir/test/python/dialects/gpu/module-to-binary-rocdl.py mlir/test/python/dialects/index_dialect.py mlir/test/python/dialects/linalg/opdsl/doctests.py mlir/test/python/dialects/linalg/opdsl/emit_convolution.py mlir/test/python/dialects/linalg/opdsl/emit_fill.py mlir/test/python/dialects/linalg/opdsl/emit_matmul.py mlir/test/python/dialects/linalg/opdsl/emit_misc.py mlir/test/python/dialects/linalg/opdsl/emit_pooling.py mlir/test/python/dialects/linalg/ops.py mlir/test/python/dialects/linalg/utils.py mlir/test/python/dialects/llvm.py mlir/test/python/dialects/math_dialect.py mlir/test/python/dialects/memref.py mlir/test/python/dialects/ml_program.py mlir/test/python/dialects/nvgpu.py mlir/test/python/dialects/nvvm.py mlir/test/python/dialects/ods_helpers.py mlir/test/python/dialects/openmp_ops.py mlir/test/python/dialects/pdl_ops.py mlir/test/python/dialects/pdl_types.py mlir/test/python/dialects/python_test.py mlir/test/python/dialects/quant.py mlir/test/python/dialects/rocdl.py mlir/test/python/dialects/scf.py mlir/test/python/dialects/shape.py mlir/test/python/dialects/smt.py mlir/test/python/dialects/sparse_tensor/dialect.py mlir/test/python/dialects/sparse_tensor/passes.py mlir/test/python/dialects/spirv_dialect.py mlir/test/python/dialects/tensor.py mlir/test/python/dialects/tosa.py mlir/test/python/dialects/transform.py mlir/test/python/dialects/transform_bufferization_ext.py mlir/test/python/dialects/transform_debug_ext.py mlir/test/python/dialects/transform_extras.py mlir/test/python/dialects/transform_gpu_ext.py mlir/test/python/dialects/transform_interpreter.py mlir/test/python/dialects/transform_loop_ext.py mlir/test/python/dialects/transform_memref_ext.py mlir/test/python/dialects/transform_nvgpu_ext.py mlir/test/python/dialects/transform_sparse_tensor_ext.py mlir/test/python/dialects/transform_structured_ext.py mlir/test/python/dialects/transform_tensor_ext.py mlir/test/python/dialects/transform_tune_ext.py mlir/test/python/dialects/transform_vector_ext.py mlir/test/python/dialects/ub.py mlir/test/python/dialects/vector.py mlir/test/python/execution_engine.py mlir/test/python/global_constructors.py mlir/test/python/integration/dialects/linalg/opsrun.py mlir/test/python/integration/dialects/pdl.py mlir/test/python/integration/dialects/transform.py mlir/test/python/ir/affine_expr.py mlir/test/python/ir/affine_map.py mlir/test/python/ir/array_attributes.py mlir/test/python/ir/attributes.py mlir/test/python/ir/auto_location.py mlir/test/python/ir/blocks.py mlir/test/python/ir/builtin_types.py mlir/test/python/ir/context_lifecycle.py mlir/test/python/ir/context_managers.py mlir/test/python/ir/debug.py mlir/test/python/ir/diagnostic_handler.py mlir/test/python/ir/dialects.py mlir/test/python/ir/exception.py mlir/test/python/ir/insertion_point.py mlir/test/python/ir/integer_set.py mlir/test/python/ir/location.py mlir/test/python/ir/module.py mlir/test/python/ir/operation.py mlir/test/python/ir/symbol_table.py mlir/test/python/ir/value.py mlir/test/python/live_operations.py mlir/test/python/multithreaded_tests.py mlir/test/python/pass_manager.py

⚠️
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⚠️

View the diff from darker here.

--- python/mlir/__init__.py	2025-09-30 20:33:24.000000 +0000
+++ python/mlir/__init__.py	2025-09-30 20:37:14.809068 +0000
@@ -1 +1 @@
-__path__ = __import__('pkgutil').extend_path(__path__, __name__)
+__path__ = __import__("pkgutil").extend_path(__path__, __name__)
--- python/mlir/dialects/__init__.py	2025-09-30 20:33:24.000000 +0000
+++ python/mlir/dialects/__init__.py	2025-09-30 20:37:14.815612 +0000
@@ -1 +1 @@
-__path__ = __import__('pkgutil').extend_path(__path__, __name__)
+__path__ = __import__("pkgutil").extend_path(__path__, __name__)