Discussion: Implement "lower-level" APIs for `cuda.parallel` that do not accept array inputs?

>> we could consider changing the API to not accept `__cuda_array_interface__` objects, and instead have the user pass in the required information (pointer, size, dtype, etc.,). This allows each library/user to compute that information in the most efficient way possible rather than making it our responsibility.
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> Let's have a separate issue to track this. Thinking about this more we should try to make the current (low-level) interface look more like a 1:1 binding to the bare C++ one. This is what we do for `cuda.cooperative` too. Pythonic interface can come later.

_Originally posted by @leofang in https://github.com/NVIDIA/cccl/issues/3718#issuecomment-2648174143_