fix(checkbox): support two way binding

- Forward events, inline functions
- Add style, remove exported props (#7)

src/components/Checkbox/Checkbox.Skeleton.svelte

@@ -1,13 +1,13 @@
 <script>
   let className = undefined;
   export { className as class };
-  export let props = {};
+  export let style = undefined;
 
   import { cx } from '../../lib';
 
   const _class = cx('--form-item', '--checkbox-wrapper', className);
 </script>
 
-<div {...props} class={_class}>
+<div on:click on:mouseover on:mouseenter on:mouseleave class={_class} {style}>
   <span class={cx('--checkbox-label', '--skeleton')} />
 </div>