Investigate using cffi to speed up git lfs interface

[blester125]

Currently we store a serialized parameter group with git lfs by making a subprocess call. This means that process needs to be spun up and the serialized data is passed via a pipe.

Look if using the c foreign function interface in python can let us call the git lfs filters (written in go) directly, avoiding spin up and piping. Example https://blog.kchung.co/faster-python-with-go-shared-objects/

This will most likely make packaging a bit harder, but maybe remove the need to install git lfs?