infer useMatchesData type using generic

[zwhitchcox]

This PR makes it possible to infer the returned type of useMatchesData with a generic type.

This makes it possible to export a hook from a layout route:

// app/routes/book.tsx
function useServices() {
	const { services } = useMatchesData<typeof loader>('routes/book')
	return services
}

and automatically infer the data in a child route:

// app/routes/book.schedule.tsx
const services = useServices() // services is typed correctly

This will not be a breaking change, because the default type will be the same as the currently cast type (Record<string, unknown>).

[zwhitchcox]

Sidenote: I know you could use useOutletContext with SerializeFrom, and that would achieve the same thing, but then you have to import the loader as somethingLoader, pass it to SerializeFrom, and it wouldn't work with deeply nested routes.