Next.js support (tracking issue)

[case-fastly]

This will require Next.js' list of NodeJS built-ins, which we'll need to keep track of. For example:

• fs - from scripts/build-native.ts
• path - from scripts/build-native.ts
• http - from packages/next/src/server/base-http/node.ts
• stream - from packages/next/src/server/app-render/use-flight-response.tsx
• async_hooks - from packages/next/src/server/web/sandbox/context.ts
• crypto - from packages/next/src/trace/shared.ts
• (etc)