fix(primitives): expose AbortController & AbortSignal types properly

[feugy]

📖 What's in there?

When @Kikobeats released 1.1.0-beta.29 and referenced it in Next.js (vercel/next.js#39898), it failed because of the new AbortSignal types

This PR fixes it

🧪 How to test it?

1. get your own copy of Next.js locally
2. in edge-runtime repository:

   pnpm i
   pnpm ln -g
   pnpm build

3. in next.js repository:

   cd packages/next
   pnpm ln -g edge-runtime @edge-runtime/primitives
   cd ../..
   pnpm --filter next ncc-compiled
   pnpm build

This should complete with no errors.

[vercel]

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Name	Status	Preview	Updated
edge-runtime	✅ Ready (Inspect)	Visit Preview	Aug 24, 2022 at 1:44PM (UTC)