feat(langchain): pass trace attributes on chain invocation #405
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PR Summary
This pull request enhances the Langchain integration with Langfuse by adding functionality to pass trace attributes on chain invocation.
- Implemented a new
traceUpdatesmap inCallbackHandlerto store userId, sessionId, and tags for top-level chain executions - Updated
handleChainStartmethod to populatetraceUpdateswith metadata from chain invocations - Modified
updateTracemethod to use stored attributes when updating traces - Added integration tests to verify correct handling of new trace attributes
- Enhanced test coverage by including assertions for userId, sessionId, and tags in trace updates
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