apt-fast manager support. #37
Description
Apt-fast is a faster version of Debian APT which I use in my GitHub Action cache-apt-pkgs.
I played with the manager interface a bit and tried to find a way to use the existing APT manager but repoint the binary from apt to apt-fast when needed, and gave up because I didn't want to make any major changes that could cause an issue in your repo. Lazily forked and just duped the manager, which I am not happy with but needed something to use (https://github.com/awalsh128/syspkg).
Wanted to get your ideas on the best way to implement this and I could put together a PR.