Register EmpiricalCovariance benchmark algorithm

[csadorf]

Adds EmpiricalCovariance to the benchmark algorithm registry so it can be used by cuML benchmark tooling.

Part of #8117

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• python/cuml/cuml/benchmark/algorithms.py

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📝 Walkthrough

Summary by CodeRabbit

• New Features
  • Added benchmarking support for the EmpiricalCovariance algorithm.

Walkthrough

This PR adds benchmarking support for EmpiricalCovariance. The changes import sklearn and cuML covariance modules, conditionally initialize the cuML implementation when available, and register an algorithm pair in the benchmark framework that maps sklearn's implementation to cuML's with accepts_labels=False.

Changes

EmpiricalCovariance benchmarking

Layer / File(s)	Summary
Module imports for covariance algorithms python/cuml/cuml/benchmark/algorithms.py	Adds imports for sklearn.covariance and conditionally for cuml.covariance to enable algorithm registration.
Algorithm definition and registration python/cuml/cuml/benchmark/algorithms.py	Conditionally initializes cuml_EmpiricalCovariance based on cuML availability and registers a new AlgorithmPair that pairs sklearn.covariance.EmpiricalCovariance with its cuML equivalent.

🎯 2 (Simple) | ⏱️ ~8 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title 'Register EmpiricalCovariance benchmark algorithm' directly and clearly summarizes the main change: adding EmpiricalCovariance to the benchmark algorithm registry.
Description check	✅ Passed	The description is directly related to the changeset, explaining that EmpiricalCovariance is being added to the benchmark algorithm registry and referencing the associated issue.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.
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.

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[viclafargue]

LGTM, but could we also add it to the benchmark config?

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[csadorf]

/merge