SelectPanel2: Add story for "create new item"

[siddharthkp]

• WIP: Still have doubts about the focus management
• Mockup: Figma
• With upcoming dialog refactor: [Do not merge] SelectPanel2: Add story for "create new item" + <dialog> refactor #4179

selectpanel-create-new-item.mov

[changeset-bot]

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Latest commit: 51d72aa

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[github-actions]

size-limit report 📦

Path	Size
dist/browser.esm.js	113.28 KB (+0.05% 🔺)
dist/browser.umd.js	113.93 KB (+0.05% 🔺)

[siddharthkp]

Note to self:

Relevant comments left on the other PR:

• [Do not merge] SelectPanel2: Add story for "create new item" + <dialog> refactor #4179 (comment)
• [Do not merge] SelectPanel2: Add story for "create new item" + <dialog> refactor #4179 (comment)

[siddharthkp]

Superseded by #4377