chore: use unbundled type declarations for @sveltejs/kit/* modules

[Rich-Harris]

We use dts-buddy to bundle our types, but the original reason for doing so doesn't really apply any more, as far as the @sveltejs/kit/* modules go — everyone uses a modern moduleResolution option now (I think the legacy ones were removed or deprecated?) which means types resolve conditions in package.exports are reliable. So we don't need to use declare module for people to be able to see the types of subpackages.

We do still need it for $app/* modules, of course. But making this change speeds up prepublishOnly, and means that cmd-click works much more reliably (no sourcemaps between you and the code).

One thing I'm not sure about is why the RequestEvent and Cookies types are being inlined into $app/server rather than imported from @sveltejs/kit. Not sure off the top of my head if that's a bug in dts-buddy or a missing piece of config or something.

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[pkg-svelte-dev]

Install the latest version of @sveltejs/kit from 8f2b6c3:

pnpm add https://pkg.svelte.dev/@sveltejs/kit/c/8f2b6c30d67ae747713fcea4b68c98d8fcb0fdf0

Open in pkg.svelte.dev: https://pkg.svelte.dev/repos/kit/pr/16775

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🦋 Changeset detected

Latest commit: 8f2b6c3

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@sveltejs/kit	Patch

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