[barrel] Use node module resolution algorithm

```ts
// codegen:start {preset: barrel, include: ./sources/index.ts, import: star }
import * as sources from './sources/index'

export { sources }
// codegen:end
```

The above could be:

```ts
// codegen:start {preset: barrel, include: ./sources/index.ts, import: star }
import * as sources from './sources'

export { sources }
// codegen:end
```