Passing scattered S3 objects into a ContainerTask

[djbutler]

I have a list of S3 objects that I need to pass into a ContainerTask, and ideally I'd like Flyte to handle the downloading rather than having the user code handle that. If all the S3 objects were in the same directory (same prefix), I could handle this with a simple FlyteDirectory. But these S3 objects are potentially scattered across different directories. Is there a construct like a List[FlyteFile] that would handle this use case?