Halide::Buffer and Runtime::Buffer should support std::mdspan

[alexreinking]

Our buffer types should be compatible with std::mdspan when moving to C++23 or even sooner via feature-detection macros.

[lagru]

Nice! Thanks for the literature sleuthing. 😊 Someone tackling this, should probably feel around if and how the new functionality can be easily integrated with the existing algorithm. Speaking from experience, anything that keeps the API simple and even more so the Cython implementation, would be very worthwhile for maintenance.

[JoOkuma]

Hi @jni, the watershed cut is also implemented in https://github.com/higra/Higra, reference in docs

[stefanv]

Maybe we can start with a set of test cases, to illustrate the different behaviors that are currently out there, and decide on what behavior would be desirable. This could make for an interested gallery example as well.

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