Allow lists to be a parameter in a function for a tool

[marklysze]

Why are these changes needed?

When a function is converted to a tool it can cause a crash if it has a parameter that is a list.

This PR is to fix this issue.

Raised as an issue on Discord, message link.

Note: I've tested if this was an issue for response formats that had a parameter as a list and it isn't.

Related issue number

N/A

Checks

• I've included any doc changes needed for https://docs.ag2.ai/. See https://docs.ag2.ai/docs/contributor-guide/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.

[codecov]

Codecov Report

Attention: Patch coverage is 84.61538% with 2 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
autogen/tools/function_utils.py	84.61%	1 Missing and 1 partial ⚠️

❗ There is a different number of reports uploaded between BASE (ad68099) and HEAD (ddd103c). Click for more details.

HEAD has 1449 uploads less than BASE

Flag	BASE (ad68099)	HEAD (ddd103c)
core-without-llm	14	1
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Files with missing lines	Coverage Δ
autogen/tools/function_utils.py	90.41% <84.61%> (-0.90%)	⬇️

... and 75 files with indirect coverage changes

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