feat(component): wrap leave variant internally

[BobbieGoede]

🔗 Linked issue

• Using transition @leave #83
• How do you animate on leave/exit? #142

❓ Type of change

• 📖 Documentation (updates to the documentation, readme or JSDoc annotations)
• 🐞 Bug fix (a non-breaking change that fixes an issue)
• 👌 Enhancement (improving an existing functionality like performance)
• ✨ 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

This conditionally wraps the motion component in a transition if a leave variant is provided, this should remove the need for users the do this manually. I'm not entirely sure what implications this has on passed attributes or other nested component/element behaviors, we could consider putting this behind a config flag if it causes issues.

In the current implementation it adds a present prop that serves the same purpose as v-if, it would be ideal if we could make the v-if directive apply on the wrapped/nested element instead.

📝 Checklist

• I have linked an issue or discussion.
• I have added tests (if possible).
• I have updated the documentation accordingly.