Add Defer Prop

[adrum]

Recreating this PR due to the master branch deletion. If the previous PR was closed on purpose, I apologize for the noise.

Original description: I felt inspired by Livewire 3 Lazy feature which automatically fetched the data on page load. I think there's a ton of value in Inertia's current Lazy prop feature, but I think there are also scenarios where adding a Defer prop feature which automatically loads Lazy data on page load.

This works in tandem with inertiajs/inertia#1617. It works by extending the Lazy feature but also informs the front-end on page load which deferred properties should be loaded automatically. These properties will then automatically trigger a reload with those properties automatically added in the only attribute.

This reduces the amount of front-end code required to pull this off. To add a long-running API query to be deferred, it would look like this:

return Inertia::render('Organizations/Index', [
            'filters' => Request::all('search', 'trashed'),
            'organizations' => Inertia::defer(
                fn () =>
                Auth::user()->account->organizations()
                ->orderBy('name')
                ->filter(Request::only('search', 'trashed'))
                ->paginate(10)
                ->withQueryString()
                ->through(fn ($organization) => [
                    'id' => $organization->id,
                    'name' => $organization->name,
                    'phone' => $organization->phone,
                    'city' => $organization->city,
                    'deleted_at' => $organization->deleted_at,
                ])
            ),
        ]);

These deferred properties will only ever be loaded automatically after page loads/navigations. Otherwise, they behave just the same as Lazy props.

[reinink]

@adrum Really appreciate you sharing this idea, but I'm going to close this one for now for the reasons stated in your other PR:

inertiajs/inertia#1617 (comment)

Once we've figured out an async story in Inertia I'd plan to loop back to this 👍