[mlir:python] Add manual typing annotations to `mlir.register_*` functions. (#170627) This PR adds a manual typing annotations to the `register_operation` and `register_(type|value)_caster` functions in the main `mlir` module. Since those functions return the result `nb::cpp_function`, which is of type `nb::object`, the automatic typing annocations are of the form `def f() -> object`. This isn't particularly precise and leads to type checking errors when the functions are used. Manually defining the annotation with `nb::sig` solves the problem. Signed-off-by: Ingo Müller <ingomueller@google.com>
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