Unify APK/RPM ecosystem helpers

[michaelkedar]

Alpine, Chainguard, Wolfi, and now MinimOS (#3430), all use the Alpine Package Keeper (APK) for their packages.

Currently, Chainguard, Wolfi, and MinimOS all have identical ecosystem helper implementations, since we don't support version enumeration for these. These should be combined into one class.

Alpine implements enumerate_versions, and needs to distinguish between Alpine releases, so it probably can stay as its own thing (but maybe could inherit from the others).

[michaelkedar]

Also, RedHat, AlmaLinux, Mageia, SUSE/OpenSUSE, and RockyLinux all use RPM. These can also be combined.