.Net: Add Enum Support for Auto-Function Calling in OpenAIAssistantAgent with Updated Test Case

[shethaadit]

Add Enum Support for Auto-Function Calling in OpenAIAssistantAgent with Updated Test Case

PR Description:
This PR addresses the issue of enum handling when invoking kernel functions through OpenAIAssistantAgent using auto-function calling. Specifically, it adds proper handling for WidgetType and WidgetColor enums in the WidgetFactory plugin.

Key Changes:

• Enhanced enum handling in WidgetFactory.CreateWidget to support automatic function invocation using enums.
• Updated test case (AddPluginsAsync) demonstrating enum support during kernel function invocation, ensuring that enums are properly parsed and handled in plugin functions.
• Added required JsonConverter for correct enum parsing in WidgetType and WidgetColor.

This change ensures that the OpenAIAssistantAgent auto-function calling can handle enums without errors and provides an example test case to validate the behavior.

Contribution Checklist

• [Y] The code builds clean without any errors or warnings
• [Y] The PR follows the SK Contribution Guidelines and the pre-submission formatting script raises no violations
• [Y] All unit tests pass, and I have added new tests where possible
• [Y] I didn't break anyone 😄

Fixes #10442

[crickman]

Hi @shethaadit, this is an insightful work-around. I am working to add support for enums, however.

[crickman]

I'm working on a fix that addresses root-cause for this issue.

[crickman]

#10513