Add module id strategy option to next config (#69319)
Adds a `experimental.turbo.moduleIdStrategy` field to `next.config.js`
to configure what module ID generation strategy to use.
`'named'` assigns readable module IDs based on the module's path and
functionality.
`'deterministic'` assigns small hashed numeric module IDs.
If not set, Turbopack will use `'named'` for development builds and
`'deterministic'` for production builds.
