Add ability to strictly type check route names

[bakerkretzmar]

This PR adds the ability for Ziggy to display type errors when passed route names that aren't present in the route list:

declare module 'ziggy-js' {
    interface RouteList {
        'home': [];
    }
    // New in this PR
    interface TypeConfig {
        strictRouteNames: true;
    }
}

route('hom'); // TypeError because there's no route called "hom"

As seen above, this functionality can be enabled by overriding the new TypeConfig interface and setting a strictRouteNames property on it to true.

This is optional and not enabled by default, although in the future we may want to consider whether this would be preferable as Ziggy's default behavior out of the box.

Thanks to @Andyuu for this solution! See #759 (comment).