feat(Button): add support for aria-current prop

[TimonVS]

Closes #6159

✅ 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:

1. Render a Button
2. Add aria-current prop with a valid value (e.g., "page")
3. The rendered button element should have the aria-current attribute with the assigned value

🧢 Your Project:

[reidbarber]

LGTM, I think this is a good addition.