[Feature] Brick System

[manstfu]

Summary

A method to mark certain blocks as "Can't be deleted" and "Single-use only." This is helpful for creating a brick system without database migrations. Models would need a pre-filled block using this method

Describe the solution you'd like

@twillBlockTitle('Blog - Article')
@twillBlockIcon('content-editor')
@twillBlockGroup('app')

@twillBlockSettings([
    'canDelete' => false, // Prevent deletion
    'canDuplicate' => false // Prevent duplication
])

Additional context

The "Add Content" button should disappear if only that block is available and already in use.

These UI elements should be removed: