feat: anchored region point anchor and mouse tracking

[scomea]

📖 Description

Note: based on this branch, will reconcile after that's merged: https://github.com/microsoft/fast/pull/6260

Anchored region did not support anchoring to arbitrary coordinates. This change adds support for that as well as a mouse tracking option.

Performance for having a tooltip like region tracking the mouse and flipping away from container edges is very good:

🎫 Issues

Someone mentioned context menus positioned by mouse click would be hard to do, this hopefully addresses that.

📑 Test Plan

Still need to add tests.

✅ Checklist

General

• [ ] I have included a change request file using $ yarn change
• [ ] 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 modified an existing component
• [ ] I have updated the definition file
• [ ] I have updated the configuration file

⏭ Next Steps

Draft PR, still need to add tests and update docs.