Support target and rel in ListGroupItem

[aldo-roman]

Summary

The <ListGroupItem> component accepts href attribute, but it does not allow opening links in a new tab.

Basic example

<script>
  import { Listgroup } from 'flowbite-svelte';
  let links = [
    {
      name: 'Accordions',
      href: 'https://mywebsite.com',
      target: '_blank',                // Added
      rel: 'noreferer noopener',       // Added
      current: true
    },
  ];
</script>

<Listgroup active items={links} let:item>
  {item.name}
</Listgroup>

Motivation

I need to open links from a ListGroup in a new tab.