Tool calls in `to_litellm_messages` does not comply with OpenAI API

[JunyiXu-nv]

In to_litellm_messages, an extra name field is added to the tool_calls field of request, which does not comply to OpenAI's API reference. This API violation will cause pydantic validation failure in apps that directly use openai sdk.

tau2-bench/src/tau2/utils/llm_utils.py

Line 151 in 337326e

"name": tc.name,

Wondering why it's so designed? Or it's just a bug.

Thanks.