fix: correctly include ambient types from adapters

[eltigerchino]

part of closing #11731

While investigating #11731 , I found that the ambient types from adapters weren't showing up when I tried installing the cloudflare, vercel, and node adapters in a fresh project and tried to access the autocomplete on event.platform.

This PR does the following:

* includes the svelte.config.js file in the generated tsconfig so that when the svelte.config.js file imports the adapter, the ambient types are included for the whole project. EDIT: separated into #12090

• references the worker types in the cloudflare adapters so that when the adapter is used, the project can access those types.
• standardises the naming of the files containing the internal adapter types and the ambient types we want included in the user's project when they add the adapter to the svelte config.
• includes the vercel and node ambient types in the package.json files array.

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🦋 Changeset detected

Latest commit: 595eb96

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

This PR includes changesets to release 4 packages

Name	Type
@sveltejs/adapter-vercel	Patch
@sveltejs/adapter-node	Patch
@sveltejs/adapter-cloudflare-workers	Patch
@sveltejs/adapter-cloudflare	Patch

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[dummdidumm]

Inclusion of the Svelte config was reverted in #11908 because it's a breaking change strictly speaking. Is it ok to hold off from doing this until 3.0?

[eltigerchino]

Inclusion of the Svelte config was reverted in #11908 because it's a breaking change strictly speaking. Is it ok to hold off from doing this until 3.0?

Oh whoops. I didn’t realise it was something we already tried to do before.

Yeah, I think it’s fine to wait for 3.0 for this. It has an easy workaround (just include the types or reference the adapter in a declaration file). Maybe I can split the ambient declaration changes and the svelte config inclusion into separate PRs?