Add `cssLayerOrder` option to module config

[mertsincan]

Users may want to set @layer's order during primevue configuration with tailwind.

// nuxt.config.js
primevue: {
   cssLayerOrder: 'tailwind-base, primevue, tailwind-utilities', // Default values
   ...
}

// tailwind.css
@layer tailwind-base {
  @tailwind base;
}

@layer tailwind-utilities {
  @tailwind components;
  @tailwind utilities;
}

Ref; https://primevue.org/tailwind/#csslayer