Add memory resource parameter to cudf::distinct_hash_join constructors

[PointKernel]

Description

Follow-up to #23220 and #23223.

This PR adds an mr parameter to the cudf::distinct_hash_join constructors to control the memory usage of the internal cuco hash table, to better align with the temporary mr effort (#20780).

Checklist

• I am familiar with the Contributing Guidelines.
• New or existing tests cover these changes.
• The documentation is up to date with these changes.

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[PointKernel]

/ok to test d0c18c6

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No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

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📥 Commits

Reviewing files that changed from the base of the PR and between 709e821 and d0c18c6.

📒 Files selected for processing (4)

• cpp/include/cudf/detail/join/distinct_hash_join.cuh
• cpp/include/cudf/join/distinct_hash_join.hpp
• cpp/src/join/distinct_hash_join.cu
• cpp/tests/join/distinct_join_tests.cpp

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📝 Walkthrough

Summary by CodeRabbit

• New Features

  • Distinct hash joins now support specifying a custom device memory resource.
  • Existing usage remains compatible through a default memory resource.

• Bug Fixes

  • Improved memory-resource handling during hash table construction.

• Tests

  • Added coverage verifying joins work correctly with tracked memory resources.

Walkthrough

Changes

Distinct hash join memory resource

Layer / File(s)	Summary
Constructor and allocator propagation cpp/include/cudf/detail/join/distinct_hash_join.cuh, cpp/include/cudf/join/distinct_hash_join.hpp, cpp/src/join/distinct_hash_join.cu	Distinct hash join constructors accept a device-accessible memory resource, forward it to the implementation, and use it for hash table allocation.
Memory resource validation cpp/tests/join/distinct_join_tests.cpp	A test tracks peak allocations through a statistics resource adaptor and validates the resulting inner join.
Estimated code review effort: 3 (Moderate)	~20 minutes

Possibly related PRs

• rapidsai/cudf#23223: Extends hash join construction with a device memory resource and propagates it to hash-table allocation.

Suggested reviewers: davidwendt, wence-

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly describes the main change: adding a memory resource parameter to distinct_hash_join constructors.
Description check	✅ Passed	The description matches the changeset by explaining the new mr parameter, its purpose, and the added tests/docs.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[vyasr]

/merge