Add Svelte 5 and Svelte Inertia

[azatakmyradov]

I've started working on this, as @renatomoor is unavailable. Svelte support was copied from #104.
My implementation is using svelte writable store, so it's consistent with the useForm from Inertia form helper.

// Inertia Form Helper
const form = useForm({
    name: '',
    email: '',
    message: ''
});

// Precognition Form Helper
const form = useForm('post', '/contact', {
    name: '',
    email: '',
    message: ''
});

Accessing errors also exactly same as the inertia form helper:

$form.errors.name
$form.valid('name')
$form.invalid('name')

Here's a repo with Inertia/Svelte already setup with simple form setup:
https://github.com/azatakmyradov/precogntion-testform

I tried to make it consistent with other precognition packages, but I haven't worked on NPM packages a lot, so let me know if I missed anything or any improvements I can make.