Pass alpine instance to alpine:init event

[DiskoPete]

I was thinking it would be nice to pass the alpine instance with the alpine:init event.
This would make it possible to not expose Alpine to the window object, if we install alpinejs as a module.

https://github.com/alpinejs/alpine/blob/main/packages/alpinejs/src/lifecycle.js#L11

dispatch(document, 'alpine:init', {alpine:this})

We then could use it like this:

<script>
    document.addEventListener('alpine:init', (event) => {
        event.detail.alpine.data('foo', () => ({
            bar: 'baz'
        }))
    })
</script>

If anyone else would think this could be useful, I would be happy to prepare a pull request.
Thanks!