[Turbopack] Support Config Similar to Webpack Resolve Fallback

[CHC383]

Goals

1. Support config similar to Webpack resolve.fallback

Non-Goals

No response

Background

There are cases where server-side modules are being imported but only be used in the server-side code, currently webpack config resolve.fallback is used to resolve "module not found" errors on the client-side code. See this Stack Overflow post for the details.

Proposal

Add turbo.resolveFallback to allow modules not being imported on the client-side code.

[gobbodev]

nothing yet? ;(