feat(CommandPalette): Add not searchable attribute on group

[maximepvrt]

🔗 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

The CommandPanel component in Nuxt UI is a powerful tool for managing and displaying search results. However, there are cases where we need to exclude certain groups from being searchable. Currently, there is no built-in feature to accomplish this.

Proposal:
Add a new attribute called "notSearchable" to the group object. When this attribute is set to true, the group will be excluded from the search functionality, and its items will always be displayed regardless of the search query.

📝 Checklist

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

[maximepvrt]

@benjamincanac I think naming the attribute static would be more appropriate.

I want to use this attribute for 2 types of groups: static groups that are always visible and groups generated by a global query search. Unfortunately, it is currently not possible to have an async search that returns multiple groups, unless I am mistaken.