chore(weave): Adds prompt to LLMAsAJudgeScorer

[jwlee64]

Description

• Enhances LLMAsAJudgeScorer to support MessagesPrompt objects in addition to string prompts
• Adds field validator to handle prompt references and object deserialization
• Improves the score() method to format prompts differently based on type
• Updates test cases with new object digests to reflect changes

Testing

• Added comprehensive test suite in tests/trace/test_llm_as_a_judge_scorer.py that tests:
  • Publishing and loading a scorer with a prompt reference
  • Scoring with a simple string prompt
  • Scoring with a MessagesPrompt and template variables

[jwlee64]

• chore(weave): Adds prompt to LLMAsAJudgeScorer #5863 👈 (View in Graphite)
• master

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[github-actions]

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[wandbot-3000]

Preview this PR with FeatureBee: https://beta.wandb.ai/?betaVersion=296451145aa9908f48bea84053bd66e8547022fb

[codecov]

Codecov Report

❌ Patch coverage is 82.60870% with 4 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
weave/scorers/llm_as_a_judge_scorer.py	82.60%	2 Missing and 2 partials ⚠️

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