Focus scope shadowdom

[padmkris123]

Partial work on 1472

✅ Pull Request Checklist:

• [✅ ] Included link to corresponding React Spectrum GitHub Issue.
• [✅ ] Added/updated unit tests and storybook for this change (for new code or code which already has tests).
• [✅ ] Filled out test instructions.
• [✅ ] Updated documentation (if it already exists for this component).
• [✅ ] Looked at the Accessibility Practices for this feature - Aria Practices

📝 Test Instructions:

Create FocusScope under a shadowDom. The focus management should continue to work.

🧢 Your Project:

Adobe Acrobat Sign

[snowystinger]

So in general this makes sense and addresses the first bullet in the issue description. I think this can go in as is, but it doesn't completely close the issue, so I'm going to edit the PR description a little to reflect that.

[snowystinger]

shouldn't need cleanup, it's called automatically by default

[dannify]

Thanks for working on this. I am going to close this PR for now since it seems to be stale. Please feel free to reopen when you get a chance to pick it up again.