Enable `get_path` command line operation to return file path for stata/r/bash/other environments

[jgerardsimcock]

Enable users to call a command get_path that will return a string to a file path in the cache.

$ fp = datafs get_path my_archive
$ fp
$ norgay:/my_archive/0.0.1

This is designed to mirror current workflow of Climate Impact Lab users who rely on file paths for their scripts.

[delgadom]

It could work like get_local_path, where get_path always returns a valid path, though sometimes it's a temporary file. We'd have to think about how to handle file cleanup though... maybe this is not solvable.

[delgadom]

also I realized my mockup was wrong... we'd want to return a valid path, e.g. /mnt/norgay_gcp/cache/my_archive/0.0.1