turbopack-230711.2
### Description * rename SourceAsset to FileSource * rename VirtualAsset to VirtualSource * add Source trait * use SourceVc in some places next.js PR: https://github.com/vercel/next.js/pull/52511
### Description * rename SourceAsset to FileSource * rename VirtualAsset to VirtualSource * add Source trait * use SourceVc in some places next.js PR: https://github.com/vercel/next.js/pull/52511