Make tool calling and structured output easier

[pweglik]

We'd like to make adoption of tool calling or simple structured output easier.
A possible solution is providing template prompts for few common use cases (possibly different prompts for different models if we observe big differences in performance).

[pweglik]

It will be partially solved by #424 It adds utility functions to make structured output easier to force on LLM and to verify output. Tool calling is left as it is for now