Why doesn't list_with_delimiter yield a BoxStream?

**Which part is this question about**

I was curious why the list and list_with_delimiter functions on the `ObjectStore` don't have the same return type 🤔

I have some ... storage with literally billions of objects The response of a ListResult from list_with_delimiter I don't understand while `list` provides a BoxStream, which I presume to be yielding results from paginated calls to the underlying storage provider.

Start by locating the ObjectStore implementations of list and list_with_delimiter, then inspect the ListResult and BoxStream types and their pagination-related tests or documentation. Clarify the intended difference in return behavior and record the explanation where users can find it; done means the API distinction and handling of large listings are understandable.

Written by the indexing model from the issue text.