Add functionality to streamed chunking

[agazso]

Currently the makeChunkedFile expects the payload to be passed in as an Uint8Array. However with big files this means that you need to read the whole file in the memory and also the resulting ChunkedFile object keeps all the leaf chunks and intermediate chunks in memory.

It would be good to have a solution to support streaming so that neither the input file needs to be in memory, neither the generated chunks (or at least not the leaf chunks).