reduce prompts with Skills

[nicho2]

Why are these changes needed?

addition of a function to reduce the weight of skills in prompts by extracting the name of the function, its parameters and its documentation

Related issue number

llm forget to use skills.py functions #2051

Checks

• [ ] I've included any doc changes needed for https://microsoft.github.io/autogen/. See https://microsoft.github.io/autogen/docs/Contribute#documentation to build and test documentation locally.
• [ ] I've added tests (if relevant) corresponding to the changes introduced in this PR.
• [ ] I've made sure all auto checks have passed.