package-vc support for :files keyword

[Daniel Fleischer]

Hi, I've been testing package-vc support in Emacs 29. It's clear that
this feature is inspired by 3rd party packages that help users install
packages from external forges. Also, it makes sense that the Melpa
recipe specification compatibility is not a goal. However, I do think
the `:files' keyword is very useful to have, and was wondering whether
it's planned, maybe in master?

Thanks, 

-- 
Daniel Fleischer