[select] fix(a11y): update active item on focus changes

[jakejrichards]

Pass handleFocus to itemRenderer to make select & query list components more accessible

Checklist

• Includes tests
• Update documentation

Changes proposed in this pull request:

Pass handleFocus to itemRenderer to make Select & QueryList components more accessible. Previously, tabbing through a query list would not update the activeItem, this caused unexpected behavior when selecting the actively focused item as it would actually select whatever was in activeItem.

These changes don't completely solve the problem as the up/down key driven state can still get out of sync with the focused item, but tabbing again will resume and we'll never select an unexpected item. I think the fully-baked solution here would go both ways focus <-> active, but this would be much greater lift.

Reviewers should focus on:

The focus here should be whether or not we consider this a viable intermediary state, and if it makes sense to update the active item "on focus" in this way. Another note is that this isn't relevant for Suggest/Multiselect components as the input is outside of the popover in those - tabbing in general is just completely broken there.

Screenshot

Before:

After:

[adidahiya]

I tried this out in the preview build; this feels like a strict improvement over the current UX, so I'm good with merging this. thanks for the PR 👍