Add transparent decompression support for .rpm files

[tstromberg]

This doesn't work yet for producing results:

go run ./cmd/mal/ analyze openssl-3.0.15-1.1.mga9.x86_64.rpm
🔎 Scanning "openssl-3.0.15-1.1.mga9.x86_64.rpm"

RPM's are renamed cpio files, AFAIK, so we made need to bring in an appropriate Go library.

malcontent/pkg/action/archive.go

Line 23 in 25e8a86

var archiveMap = map[string]bool{

is where I would start as far as implementing this feature.

[egibs]

I'll see about doing .deb files as well since I was trying to scan one earlier today.