Allow mapping to multiple class names

[Ti-tanium]

Fixes: #292 #221

This PR would allow users to map one theme to multiple custom classes.

The value can now accept a string or string[] as value.

if we want to map a theme to multiple custom theme values, we can simply pass an array:

<ThemeProvider attribute='class' value={{ pink: ['my-pink-theme', 'another-pink-theme'] }}>

When the selected theme is pink, both my-pink-theme and another-pink-theme will be added as class names.

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
next-themes-basic	❌ Failed (Inspect)			Jun 5, 2024 7:18pm
next-themes-tailwind	❌ Failed (Inspect)			Jun 5, 2024 7:18pm
next-themes-with-app-dir	❌ Failed (Inspect)			Jun 5, 2024 7:18pm

[dir]

+1 to this, would be so helpful