chore: add cds theme switcher to storybook

[kevinbuhmann]

PR Checklist

Please check if your PR fulfills the following requirements:

• [N/A] Tests for the changes have been added (for bug fixes / features)
• [N/A] Docs have been added / updated (for bug fixes / features)
• [N/A] If applicable, have a visual design approval

PR Type

Storybook

What is the current behavior?

There is no theme switcher.

What is the new behavior?

You can switch between the default, cds light, and cds dark themes. The theme is only applied to the preview canvas, not the manager.

Does this PR introduce a breaking change?

No.

[github-actions]

👋 @kevinbuhmann,

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Thank you,

🤖 Clarity Release Bot

[github-actions]

🎉 This PR is included in version 13.5.0 🎉

The release is available on:

• GitHub release
• v13.5.0

Your semantic-release bot 📦🚀

[github-actions]

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