feat(VCarousel): add mousewheel prop for scroll navigation

[sridhar-3009]

Closes #22893

Summary

Adds a mousewheel prop to v-carousel that enables mouse-wheel (and trackpad scroll) navigation between slides. Disabled by default to preserve existing behavior.

• Scroll down / right → next slide
• Scroll up / left → previous slide
• 300ms cooldown prevents accidental multi-slide jumps per scroll gesture
• Uses { passive: false } so preventDefault() suppresses page scrolling while hovering over the carousel
• Handler is registered on mount and cleaned up on unmount; responds reactively if the prop is toggled at runtime

Usage

<v-carousel mousewheel>
  <v-carousel-item v-for="item in items" :key="item" />
</v-carousel>

Changes

• packages/vuetify/src/components/VCarousel/VCarousel.tsx — add mousewheel prop and wheel event handler
• packages/docs/src/examples/v-carousel/prop-mousewheel.vue — new example
• packages/docs/src/pages/en/components/carousels.md — document the prop

[J-Sek]

closing in favor of #22906