* refactor: remove prompt_messages from LLMResult and LLMResultChunk
* fix: add backward compatibility for deprecated prompt_messages field in LLMResult and LLMResultChunk
* fix: set default value for prompt_messages field to an empty list in LLMResult and LLMResultChunk for backward compatibility
* feat: add test for LLMResult to validate prompt_messages field and ensure backward compatibility
* apply ruff
Yeuoly