[Menu] Add CheckedChanged EventCallback (fix 3390)

[rpodevns]

Pull Request

📖 Description

Add CheckChanged EventCallback to FluentMenuItem and FluentMenu. Fix #3390

👩‍💻 Reviewer Notes

Not sure if this is the best approach so needing feedback for sure.

📑 Test Plan

✅ Checklist

General

• I have added tests for my changes.
• I have tested my changes.
• I have updated the project documentation to reflect my changes.
• I have read the CONTRIBUTING documentation and followed the standards for this project.

Component-specific

• I have added a new component
• I have added Unit Tests for my new component
• I have modified an existing component
• I have validated the Unit Tests for an existing component

⏭ Next Steps

[vnbaaij]

@rpodevns Is this ready to go?

[rpodevns]

The manual tests I did seem to work fine. Did you have a chance to try it?