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Enhance OpenAI provider parameter handling

- Introduced a new validation function `validate_mutex!/3` in the `ReqLLM.Provider.DSL` module to ensure that conflicting parameters are not used together, improving error handling for provider options.
- Updated the OpenAI provider to dynamically determine the appropriate token parameter (`max_tokens` or `max_completion_tokens`) based on the model name, enhancing compatibility with different OpenAI models.

This change improves the robustness of parameter handling and aligns with the recent enhancements for model-specific option translation.