Prototype mirroring of a single HCA file

[hannes-ucsc]

This is to get our feet wet with the epic and to quickly identify potential technological obstacles to our implementation.

Write a script that, given the name of a catalog and the ID of a file in that catalog (same parameters as the /repository/files endpoint), copies that file from TDR to the storage bucket of the current deployment (via multi-part upload), signs a URL to that file and prints the URL. The signed URL should bake in the Content-Type (using the file's content-type) and Content-Disposition (using the file's name) headers for the response.

[hannes-ucsc]

For demo, invoke the script to mirror a sequence file. Download the file using the resulting signed URL and show that the file is complete and valid.