Get studio prompts

This property isn't in the official documentation, but it's in the documentation for the official library for python:

• https://github.com/openai/openai-python/blob/main/chatml.md
• https://github.com/openai/openai-cookbook/blob/main/examples/How_to_count_tokens_with_tiktoken.ipynb

For Role=tool prompts this should be set to the ID given in the assistant's prior request to call a tool.

For Role=assistant prompts this may be set to the tool calls generated by the model, such as function calls.