feat(evaluators): add new lluna client

[namrataghadi-galileo]

Summary

• What changed and why.

Scope

• User-facing/API changes:
• Internal changes:
• Out of scope:

Risk and Rollout

• Risk level: low / medium / high
• Rollback plan:

Testing

• Added or updated automated tests
• Ran make check (or explained why not)
• Manually verified behavior

Checklist

• Linked issue/spec (if applicable)
• Updated docs/examples for user-facing changes
• Included any required follow-up tasks

[codecov]

Codecov Report

❌ Patch coverage is 75.25084% with 74 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
.../agent_control_evaluator_galileo/luna/evaluator.py	67.83%	46 Missing ⚠️
...src/agent_control_evaluator_galileo/luna/client.py	77.98%	24 Missing ⚠️
...src/agent_control_evaluator_galileo/luna/config.py	91.89%	3 Missing ⚠️
...ks/python/src/agent_control/evaluators/__init__.py	80.00%	1 Missing ⚠️

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