Add logging to LLM dataset generators

[aviralgarg05]

Currently, LlamaDatasetGenerator and OpenAIDatasetGenerator fail silently or work opaquely. There is no visibility into the generated prompts or raw responses.

Task:

• Add a logger to src/agentunit/generators/llm_generator.py.
• Log the generated prompt (debug level).
• Log the raw response text before parsing (debug level).
• Log any parsing errors (error/warning level).

[web4akash]

Hi @aviralgarg05 , I’m working on this issue, expected to submit PR soon.