feature: add function calling

[toukoum]

FIRST OF ALL, CONGRATS ON YOUR AMAZING WORK—IT’S TRULY IMPRESSIVE! 🎉

Hey there! I just wanted to check if there’s already a simple way to implement function calling for external use cases, like in the big boy here: https://docs.openwebui.com/features/plugin/functions/

[jakobhoeg]

Thank you for the kind words, @toukoum!
The current version does unfortunately not support this, but I'll add it to the feature list :)