Support Next.js "Statically Typed Links"

[theoludwig]

Is your feature request related to a problem? Please describe.

Make the functions from createSharedPathnamesNavigation (imported from next-intl/navigation) type safe when experimental.typedRoutes is enabled (in next.config.js).

Next.js documentation: https://nextjs.org/docs/app/building-your-application/configuring/typescript#statically-typed-links

Describe the solution you'd like

Type Safe routing with:

import { createSharedPathnamesNavigation } from "next-intl/navigation"

export const { Link, redirect, usePathname, useRouter } =
  createSharedPathnamesNavigation(routing)

I've used the same repo for the bug reproduction for #1402 but created another branch to try enabling experimental.typedRoutes: https://github.com/theoludwig/next-intl-bug-repro-relative-time-now/tree/typed-routes

Ideally we should be able to use the types generated in .next/types/link.d.ts, but ignore the slug [locale], and have type safe links, for example:

<Link href="/items">Items Page</Link>

{/* TypeScript Error! */}
<Link href="/do-not-exist-page">Items Page</Link>

Describe alternatives you've considered

No type-safety for links.

[theoludwig]

Ah oops, a similar issue already exists.
Closing as it's a duplicate, sorry for the noise. 😅

#396