feat(Accordion): add unmount prop to allow lazy mounting for heavy components

[noook]

🔗 Linked issue

❓ Type of change

• 📖 Documentation (updates to the documentation or readme)
• 🐞 Bug fix (a non-breaking change that fixes an issue)
• 👌 Enhancement (improving an existing functionality)
• ✨ New feature (a non-breaking change that adds functionality)
• 🧹 Chore (updates to the build process or auxiliary tools and libraries)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

When dealing with Accordion with 10+ more list items that have heavy components inside the disclosure, every state change on the accordion items can slow down or block the page.

This PR allows configuring the DisclosurePanel to not be mounted unless the panel is open. When unmount is false (default), the previous behaviour (static) applies.

📝 Checklist

• I have linked an issue or discussion.
• I have updated the documentation accordingly.

[benjamincanac]

It would have been easier to to just handle the unmount prop on the DisclosurePanel component without the static and v-show but if I remember correctly it breaks the transition.

[noook]

Yes that's exactly why I use the reuseTemplate, because static requires us to handle the div with a v-show or v-if around for the display condition

[benjamincanac]

@noook This seem to break the whole documentation: https://ui-7z2kyn5b0-nuxt-js.vercel.app/components/accordion

[noook]

I don't know why createReusableTemplate was causing issues here, this should be strictly equivalent 🤔