fix(client): some minor code fixes...

[XenoAmess]

Important

Fix default mutable arguments, improve exception handling, and add missing class method decorator in various files.

• Behavior:
  • Fix default mutable arguments in create_prompt(), update_prompt(), observe_llama_index(), and get_llama_index_handler() in client.py by setting default to None and initializing inside the function.
  • Improve exception handling in jsonable_encoder() in jsonable_encoder.py by directly initializing the errors list with the caught exception.
• Functions:
  • Add missing @classmethod decorator to flush() in openai.py.
• Misc:
  • Rename generate_error_message_fern() and handle_fern_exception() to use Exception instead of Error in parse_error.py.
  • Change default value of exclude to None in auto_decorate_methods_with() in error_logging.py.

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Greptile Summary

Disclaimer: Experimental PR review

This PR improves code quality and type safety in the Langfuse Python SDK by addressing mutable default arguments and enhancing error handling.

• Fixed mutable default arguments in client.py by changing empty lists/dicts to None in methods like create_prompt() and update_prompt()
• Added missing @classmethod decorator to flush() in langfuse/openai.py for proper class method behavior
• Simplified error handling in jsonable_encoder.py by directly initializing errors list with caught exceptions
• Updated type hints from Error to Exception in parse_error.py for more flexible error handling
• Changed default value of exclude to None in error_logging.py to avoid mutable default argument issues

The changes follow Python best practices by preventing shared state issues with mutable defaults while maintaining existing functionality.

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LGTM

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