Package/export command

[lacraig2]

This PR adds a new command for penguin: package/export (aliased names) which packages a project based at a config into a minimal distributable archive file.

penguin package --help
Usage: penguin package [OPTIONS] PROJECT_DIR

  Package a penguin project into a distributable archive.

  Creates a tar.gz pulling in configs, base, and static patches while omitting
  results and qcows.

Options:
  -o, --out TEXT  Output tar.gz file path. Defaults to
                  <project_dir_name>.tar.gz
  -v, --verbose   Set log level to debug
  --help          Show this message and exit.

The purpose is to enable quickly distributing projects between people and keeping versions of projects around.

A project can be unpacked in the following way:

mkdir o
cd o
tar -xvf $PROJECT_TAR_PATH

There is a .penguin_packaged_version accompanying each tar to give you some context on which version was used when packaging this system. It is yaml with the following format:

format_version: 1
penguin_version: VERSION

I suspect that we'll add more information to this over time and maybe add an import/reproduction process, but for the moment it seemed sufficient to make this versioned and contain the penguin version.

CLOSES: #564