docs(SelectPanel): update docs with keyboard interactions

[joshblack]

This PR updates the docs for SelectPanel to document the keyboard behaviors supported by the component. It also adds in an initial Status section and initial Props.

Questions

• Is the interaction guidance here appropriate? I wasn't sure if keyboard interaction docs should live here or somewhere else 👀
• What's the best way to write out the props for SelectPanel using the existing MDX components?
• Is the ComponentChecklist correct?

References

• https://github.com/github/primer/issues/1021

[changeset-bot]

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Latest commit: d3a7a13

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

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[github-actions]

size-limit report 📦

Path	Size
dist/browser.esm.js	77.21 KB (0%)
dist/browser.umd.js	77.85 KB (0%)