Add 'Tab' and 'Shift+Tab' for item navigation

[daun-io]

This PR adds 'Tab' and 'Shift+Tab' for item navigation

In general, users with heavy keyboard experience expect:

• Pressing 'Tab' should navigate to the next item.
• Pressing 'Shift + Tab' combo to navigate in the reverse direction.

After playing with examples, I don't see major issues with this implementation.

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Name	Status	Preview	Comments	Updated
cmdk-website	✅ Ready (Inspect)	Visit Preview	💬 Add your feedback	Feb 16, 2023 at 4:24AM (UTC)