fix(breadcrumbs): support computed overrides

[thorge]

This PR introduces enhancements to the useBreadcrumbItems function in order to facilitate the dynamic updating of breadcrumbs, e. g. based on route parameters.

🔗 Linked issue

Resolves #327

❓ Type of change

• [ ] 📖 Documentation (updates to the documentation or readme)
• [ ] 🐞 Bug fix (a non-breaking change that fixes an issue)
• [x] 👌 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

• Changed the type of overrides in BreadcrumbProps from an array to MaybeRefOrGetter<(BreadcrumbItemProps | false | undefined)[]> to allow for computed values.
• Updated the assignment of overrides to use toValue for proper reactive handling of the options.overrides.

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[harlan-zw]

Thanks!