SimpleMenu: Add size prop and define small size

[gu-stav]

As proposed in strapi/strapi#12213 this PR introduces a size prop for SimpleMenu, to decrease the padding of the trigger button. The default (size=M) stays the same as it is.

Screenshots

ℹ️ I've added the background manually to display the difference. It won't be visible by default (on hover/ focus only).

Demo

https://design-system-git-feat-simple-menu-small-strapijs.vercel.app/?path=/story/design-system-components-simplemenu--sizes

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design-system – ./

🔍 Inspect: https://vercel.com/strapijs/design-system/9i2AWaioRcs4XM2QysbGq91AZ7H9
✅ Preview: https://design-system-git-feat-simple-menu-small-strapijs.vercel.app

design-system-website – ./website

🔍 Inspect: https://vercel.com/strapijs/design-system-website/C6t2Bz6FgcwmQ7fk78yK5RXTh11A
✅ Preview: https://design-system-website-git-feat-simple-menu-small-strapijs.vercel.app

[gu-stav]

@HichamELBSI Thanks for the review again. I think everything you suggested makes sense. Before merging this, I'd like to talk with @maevalienard on Monday, because this change would need to be reflected in Figma too (I guess).

[HichamELBSI]

@HichamELBSI Thanks for the review again. I think everything you suggested makes sense. Before merging this, I'd like to talk with @maevalienard on Monday, because this change would need to be reflected in Figma too (I guess).

Sure! I'll convert this PR as Draft then (for the moment) 👍🏽

[maevalienard]

Can we add to the StoryBook documentation the purpose of the S size SimpleMenu? :)