feat(ui): Implement `<Alert />` component

[alexcarpenter]

Description

https://linear.app/clerk/issue/SDKI-28/implement-global-error

Checklist

• [ ] npm test runs as expected.
• [ ] npm run build runs as expected.
• [ ] (If applicable) JSDoc comments have been added or updated for any package exports
• [ ] (If applicable) Documentation has been updated

Type of change

• [ ] 🐛 Bug fix
• [x] 🌟 New feature
• [ ] 🔨 Breaking change
• [ ] 📖 Refactoring / dependency upgrade / documentation
• [ ] other:

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: f21d252535433440fcbaf02d71a120a373114c62

The changes in this PR will be included in the next version bump.

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