Add SetFunctions to OpenAI LLM

[pedro-a-n-moreira]

Description

I have a specific case where I'm modifying the functions' description, mostly enum options, at run time. The issue is that the current struct-based approach makes it too difficult.

The solution is having a SetFunctions method for the LLM, so we can create our own function's schema. This two lines of code will save a lot of pain:

// File: llm/openai/function.go

// SetFunctions is a setter the functions list
func (o *OpenAI) SetFunctions(funcs map[string]Function) { o.functions = funcs }

Fixes #228

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration

• Regular unit tests

Checklist:

• I have read the Contributing documentation.
• I have read the Code of conduct documentation.
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• I have checked my code and corrected any misspellings

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[henomis]

Sounds good to me, could you please add SetFunction as well?

[pedro-a-n-moreira]

Yes, I try to make it today.