Rename cuco .hpp headers to .cuh

[PointKernel]

Description

Follow-up of #9696.

This PR renames the two remaining .hpp headers in cuda/experimental/__cuco (detail/prime.hpp and detail/utility/traits.hpp) to .cuh, updates their header guards and the two include sites accordingly. All cuco headers now carry the .cuh extension, so the existing cuda/experimental/*.cuh glob in the cudax header test covers them and the dedicated .hpp glob from #9696 is no longer needed. Both headers compile standalone.

Checklist

• New or existing tests cover these changes.
• The documentation is up to date with these changes.

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ℹ️ Recent review info

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📥 Commits

Reviewing files that changed from the base of the PR and between 69702a9 and c87f42b.

📒 Files selected for processing (4)

• cudax/include/cuda/experimental/__cuco/capacity.cuh
• cudax/include/cuda/experimental/__cuco/detail/open_addressing/open_addressing_ref_impl.cuh
• cudax/include/cuda/experimental/__cuco/detail/prime.cuh
• cudax/include/cuda/experimental/__cuco/detail/utility/traits.cuh

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📝 Walkthrough

Summary by CodeRabbit

• Chores
  • Updated internal header references and guard names for better consistency across CUDA Experimental cuCO components.
  • Standardized include paths used by related low-level utilities.
  • No user-facing APIs or behavior changed.

Walkthrough

Header files under cudax/include/cuda/experimental/__cuco are renamed from .hpp to .cuh naming convention. Include guard macros in prime.cuh and traits.cuh are updated to match, and dependent includes in capacity.cuh and open_addressing_ref_impl.cuh are updated to reference the renamed files.

Changes

cuco header extension rename

Layer / File(s)	Summary
Renamed header guards cudax/include/cuda/experimental/__cuco/detail/prime.cuh, cudax/include/cuda/experimental/__cuco/detail/utility/traits.cuh	Include guard macros and closing #endif comments renamed from _HPP to _CUH suffixes.
Updated includes referencing renamed headers cudax/include/cuda/experimental/__cuco/capacity.cuh, cudax/include/cuda/experimental/__cuco/detail/open_addressing/open_addressing_ref_impl.cuh	Include directives updated from prime.hpp/traits.hpp to prime.cuh/traits.cuh.

Suggested reviewers: srinivasyadav18, bernhardmgruber

suggestion: confirm the actual files were renamed on disk (hpp→cuh) rather than just guard/include text changes, to avoid dangling old files.

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