Migrate useForm to new Inertia Form component

[joetannenbaum]

This PR utilizes the new Inertia Form component on all screens where it makes the most sense, reducing boilerplate.

[jrd-lewis]

Shouldn't the onFinish methods from the previous useForm go to @finish on the new Form component instead of @submit-complete?

[joetannenbaum]

@jrd-lewis this is a trade-off we decided to take for the sake of long term consistency without possible breaking changes.

@finish is equivalent to onFinish in the original, but it doesn't have access to the reset method, which is specific to the form. So we added a new @submit-complete that allows you to tap into form-specific methods and clean up if you need to.

[kaspernowak]

@joetannenbaum How would we use Laravel Precognition with the Inertia <Form> component?
The Laravel Precognition documentation recommends using the starter kits, but it's usage seems to be exclusively tied to useForm:

Precognition pairs especially well with Laravel's Inertia-based starter kits.

With the Laravel Precognition package installed, you can now create a form object using Precognition's useForm function, providing the HTTP method (post), the target URL (/users), and the initial form data.

[kaspernowak]

@joetannenbaum I added a PR to the Laravel Precognition repo to implement a precognitive Form / PrecognitionForm component.