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## Why are these changes needed?
I was getting the following exception when doing tool calls with
anthropic - the exception was coming form the `__str__` in
`LLMStreamStartEvent`.
```
('Object of type ToolUseBlock is not JSON serializable',)
```
The issue is that when creating the LLMStreamStartevent in the
`create_stream`, the messages weren't being serialized first.
## Related issue number
Signed-off-by: Peter Jausovec <peter.jausovec@solo.io>
Co-authored-by: Eric Zhu <ekzhu@users.noreply.github.com>