RAC Breadcrumbs: add support for autoFocusCurrent

[reidbarber]

For parity with RSP breadcrumbs: https://react-spectrum.adobe.com/react-spectrum/Breadcrumbs.html#props

✅ 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:

Check story, docs prop table, and test.

🧢 Your Project:

[snowystinger]

oo, nice, didn't know about this matcher. we can replace expect(document.activeElement).toBe(links[2]) everywhere eventually

[reidbarber]

That would be an easy ast-grep codemod:

rule:
  pattern: expect(document.activeElement).toBe($A)
fix: expect($A).toHaveFocus()

I'm actually curious if that matcher is any faster. If so, we could probably speed up our suite a good bit, as much as we check for focus.

[reidbarber]

Just tried locally out of curiosity. Didn't clear cache or do any other isolation measures though:

Before:

Time:        192.227 s

After:

Time:        160.324 s

[snowystinger]

hmm i wouldn't think it would be faster, document.activeElement is just an access to something already up to date, and then followed by an identity check. I imagine it's what the matcher is doing behind the scenes as well. ok, yep, it is, https://github.com/testing-library/jest-dom/blob/f03a582827453de6fac4510dcf4fa3148c7ed68a/src/to-have-focus.js#L7
so I'm betting you're seeing caching of some sort

[rspbot]

Build successful! 🎉

• View the storybook
• View the storybook-17
• View the storybook-16
• View the documentation

[rspbot]

## API Changes

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