export namespace object instead commonjs interop object (#5619)

### Description

needed for next.rs API: next.js checks if routes doesn't contain a
default export

### Testing Instructions

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  Give a quick description of steps to test your changes.
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crates/turbopack-build/src/ecmascript/node/entry/chunk.rs

@@ -138,7 +138,8 @@ impl EcmascriptBuildNodeEntryChunk {
         writedoc!(
             code,
             r#"
-                    module.exports = runtime.getOrInstantiateRuntimeModule({}, CHUNK_PUBLIC_PATH).exports;
+                    const internalModule = runtime.getOrInstantiateRuntimeModule({}, CHUNK_PUBLIC_PATH);
+                    module.exports = internalModule.namespace ?? internalModule.exports;
                 "#,
             StringifyJs(&*runtime_module_id),
         )?;