Support HDF5/JLD/JLD2 format

[oxinabox]

While none of these formats support directly streaming, and need to file
we could always work around that by creating tempfiles,
then reading them back in.

And that will be fine since most linux puts TMPDIR on a ramdrive right?

this is how I used to save data in the JLD, on SwiftObjectStorage
https://github.com/oxinabox/SwiftObjectStores.jl/blob/45acf6e5b9446672674964122763528a4d452322/src/upload.jl#L42-L51

[rofinn]

We could support that, but it won't be useful for our use case on AWS Batch. On batch, we don't want large temp files in our containers as this will complicate our configuration and result in blocking on IO more often.