feat(usePrefersDark): add utility export

[mmamedel]

This usePrefersDark utility provides a reactive boolean that reflects whether the user prefers dark mode based
on their browser or OS settings. It uses the prefers-color-scheme media query and updates automatically when the preference changes.

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[TGlide]

Thanks for the PR! I think usePrefersColorScheme would be better imo, similar to https://vueuse.org/core/usePreferredColorScheme/#usepreferredcolorscheme

[TGlide]

also a class would be better here

[mmamedel]

Made some changes to align it closer to the VueUse implementation.