feat: Function calling for OpenAI Compatible Chat Completion API

[XunchaoZ]

Feature request

Need to support function calling for the OpenAI Chat Completion API.

Motivation

Suggested by Aaron.

Other

No response

[aarnphm]

cc @XunchaoZ might worth taking a look into this.

[chymian]

any news on this? OpenLLM & Bento seem to be a good solution for our task, running on permise Backends with cloud-redundance. one requirement is to be met: to be current and 100% feature compatible with OpenAI, which is the defacto standard, if we like it or not. ;)