fix(media): allow setting IO media via decorator update

[hassiebp]

Important

Fixes JSON serialization of output in _handle_call_result in langfuse_decorator.py and updates test_media in test_decorators.py to verify media handling.

• Behavior:
  • In langfuse_decorator.py, _handle_call_result now directly serializes result using json.dumps and json.loads with EventSerializer to ensure proper JSON serialization.
• Tests:
  • In test_decorators.py, test_media is updated to check that media references in input, output, and metadata are correctly serialized and deserialized.

^{This description was created by for 1ad58c0. It will automatically update as commits are pushed.}

[greptile-apps]

Disclaimer: Experimental PR review

PR Summary

Improved media object handling in the Python SDK's decorator system by consolidating JSON serialization of outputs for more reliable media object processing.

• Modified _handle_call_result in /langfuse/decorators/langfuse_decorator.py to use single-step JSON serialization for outputs
• Added media object support tests in /tests/test_decorators.py to verify nested media handling within input/output/metadata dictionaries
• Enhanced decorator update functionality to properly handle LangfuseMedia objects in trace updates

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