add function calling example

Hi Jan @s2817051--tu-dresden.de ,

here comes a PR with a function calling example using the ScaDS.AI LLM server. The Qwen/QwQ-32B-Preview model works okish for this purpose. There may be better models, but for demonstrating the principle this notebook should be enough for now.

Let me know what you think or feel free to merge!

Best, Robert