feat: add cache retry logic for unsupported providers

[GangGreenTemperTatum]

add cache retry logic for unsupported providers

#20

when caching is enabled but the LLM provider doesn't support it, detect cache_control errors and automatically retry without caching instead of failing the entire challenge run

Key Changes:

• add cache retry logic for unsupported providers

Added:

• add cache retry logic for unsupported providers

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Generated Summary:

• Added new error handling in the chat execution flow to detect caching-related errors when "cache_control" appears in the error message.
• Integrated logic to disable caching (setting cache to False) and retry the chat request using a new pipeline.
• Implemented specific exception handling for various API errors (InternalServerError, BadRequestError, Timeout, ServiceUnavailableError, APIConnectionError) during the retry.
• Included logging and metric tracking (e.g., "cache_unsupported", "failed_chats") to monitor caching issues and retry outcomes.

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