Turbopack: less turbo tasks for `chunk_item.id()` (#76110)
- Every `EcmascriptChunkItem` already had a `chunking_context()` getter via the `ChunkItem` supertrait.
- Produce less turbo tasks for `chunk_item.id()`
- In the future, we really want to move `chunking_context.chunk_item_id()` to the module graph, (or split it out and instead pass a `Vc<ModuleIdStrategy>`). That is however a refactoring we don't need to do right now.
This showed up in the traces, but overall it doesn't seem to have an effect on perf.
Before:
After:
