[REQ] WACZ format support (zip alias)

[Shrinks99]

Is your feature request related to a problem? Please describe

WACZ is a spec for bundling web archive data stored as WARC files along with extra metadata and indexing information. It's also just a ZIP file, but many users don't innately know that, and as it gets adopted by more users (recently recommended by the Library of Congress and National Library of Norway) it would be great if the unarchiving tools that people already use are able to provide native support for it.

Describe the solution you'd like

Would be great if Keka could recognize WACZ as a supported format so they will uncompress when opened by the program instead of compressing? It's just a ZIP with a different name! Hopefully easy to add an alias :)

Describe alternatives you've considered

Everything currently works as expected if the user uses Keka's Finder extension to extract the WACZ's contents or if the default action is set to uncompress. This works, but not quite as user friendly as being able to double click the file, or use "Open With" in the right click menu and have it work by default.