Investigate making the Linux EdkRepo installer a "zipapp"

Our current Linux release consists of a tarball containing several Python wheels, configuration files, and an installation script written in Python.

Instead of using a tarball, it would be nicer to create a "zipapp": https://docs.python.org/3/library/zipapp.html

In a nutshell, the installer would become a single .pyz file that would self-extract and then install EdkRepo.