feat: Add new LLMEvaluator component

[julian-risch]

Related Issues

• fixes LLM Eval - Implement custom LLM evaluator component in core #7023

Proposed Changes:

• Add a new component LLMEvaluator that is limited to the OpenAI api for now and evaluates inputs based on provided instructions and examples

How did you test it?

• New unit tests
• I used an example that can be adjusted to become an integration test or end to end test.

Notes for the reviewer

An open question currently is how to enforce proper json formatting in the rendered prompt template. Main issue I see is " or ' being used inconsistently and thus maybe causing worse generated results.

Current output is {'score': 1, 'name': 'llm'} in the style of the evaluation framework integrations.
We can make llm customizable as an additional parameter of LLMEvaluator later if it makes sense or leave it out completely.

Checklist

• I have read the contributors guidelines and the code of conduct
• I have updated the related issue with new insights and changes
• I added unit tests and updated the docstrings
• I've used one of the conventional commit types for my PR title: fix:, feat:, build:, chore:, ci:, docs:, style:, refactor:, perf:, test:.
• I documented my code
• I ran pre-commit hooks and fixed any issue

[coveralls]

Pull Request Test Coverage Report for Build 8411689560

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.1%) to 89.399%

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Totals
Change from base Build 8400580788:	0.1%
Covered Lines:	5490
Relevant Lines:	6141

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💛 - Coveralls

[shadeMe]

LGTM! Great work 🎉 Good to merge after fixing the lint.