[BUG] LLMStreamChunkEvent has no differentiator

[Vidit-Ostwal]

@cloud-java Hello, I am currently using FastAPI and Crewai, and I am encountering an issue: there seems to be no property like message_id in LLMStreamChunkEvent that allows me to determine which streams belong to the same message. Currently, I am using task_id and agent_id, but I have found that in the same task, the same agent may speak twice, which may cause two messages to merge together. I see that you seem to have implemented this feature. Can you share how to solve this problem

Originally posted by @ssssshql in #3739

[github-actions]

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[Vidit-Ostwal]

Commenting to keep this active