Task: Implement versatile checkbox primitive system

[emmbm]

Task Description

Svelte's bind:group syntax becomes problematic when trying to implement composable components for versatile use cases. More specifically, this behavior affects the workings of checkboxes / radio buttons / select:multiple / etc.

Ressources

• bind:group does not work with nested components sveltejs/svelte#2308
• https://svelte.dev/repl/b63c813830274248a8fee5ecc667b15c?version=3.12.1
• https://svelte.dev/repl/6a17f4105e2b4bcd8d2df3eaff5bce0d?version=3.38.3
• [@svelteui/core] Checkbox group svelteuidev/svelteui#46

List of actions

• Chose an avenue
• Document explicitly in primitive dir's readme
• Complete implementations

[emmbm]

Maybe the approach taken in #104 could present potential here also.

[emmbm]

Outdated issue, the described stake is currently not encountered with our new approach prioritizing global styles over style-centric componentization.