Radio inputs - fix arrow button functionality

[vgpena]

What:

This PR fixes a bug where keyboard navigation through radio inputs did not work as expected (#1048).

Why:

This gives us true-to-life outputs when radio inputs are tested with the keyboard.

How:

1. Sending correct directions for up/down arrows - Based on native browser interactions plus this W3C spec for a widget based on radio inputs, Down/Right arrows should move us forward in the group, and Up/Left should move us back. I adjusted keydown.ts to send the correct directions for Down and Up key events.
2. Only advancing one element at a time - The initial behavior seemed to move us through every valid radio input within a group. I've updated radio.ts so that we only move forwards or backwards by 1 valid radio input.

Checklist:

• Documentation
• Tests
• Ready to be merged
  

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[ph-fritsche]

Thanks for taking the time to contribute to this library ❤️

[vgpena]

@ph-fritsche Please let me know if I should do anything to address the failing linting job. I would volunteer to make the fixes, but the issues are all in files that this PR didn't change.

If it helps in debugging, I get these linting issues when running npm run lint locally on vgpena:pr/radio-keyboard and on testing-library:main, even though the linting job is passing in CI on testing-library:main.

Thanks!

[filipw01]

@ph-fritsche @vgpena I'm willing to work on this. If there is something I can do to push this forward just let me know

[tnyo43]

Any update for this? I want the bug to be fixed, so I would create another PR if you don't finish this.

[joshferrell]

Just saw this PR, looks like it's the same as the implementation I had, but I added an additional test to ensure that aria-disabled was still selectable.

#1199

Happy for either fix to go through, but would be great to an eye on one of these from a maintainer. Is there anything blocking this particular PR at this point?

[joshferrell]

@ph-fritsche Is there anything blocking this PR still? Would be happy to make any edits, looks like this is just blocked on maintainer review.