draft: typesafety

[pcattori]

Fixes #12373

This PR refactors typegen to be "route ID centric" based on the route manifest produced by routes.ts.
This architecture better supports the fixes/features also added in this PR:

• Fix: matches are typed to be precise for child routes
• Feature: Type-safe paths viahref
• Feature: Type-safe access for other routes via useRoute

TODO

• decide if requiring {} for paths that have only optional params is good or bad
• clean up the old route-modules, register.ts, etc.
• support custom app dir (no hardcoded app/)
• type-safe handle within matches
• loaderData with hydrate = true respects HydrateFallback set in parent routes
• try it with a huge app (1000+ routes)
• tests
• changeset

href

Construct type-safe paths for navigation with href:

import { href } from "react-router"

const home = href("/home")
const productUrl = href("/products/:id", { id: "asdf" })
<Link to={href("/foo/:bar/", { bar: "baz" })

[changeset-bot]

⚠️ No Changeset found

Latest commit: 759a11a

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[pcattori]

Note: need to update test fixtures to include *.ts (not just *.d.ts) from .react-router/types

[pcattori]

Type-safe href merged in #12994