package-dumpinfo,metadata: add ABI version information to package index

package-dumpinfo,metadata: add ABI version information to package index

There is no standard for ABI versioning, so its not possible to find out
from `libext2fs2`, `libiwinfo20230701` or `libss2` package names if
thats just package name or package name with ABI version included. To
help with the decision, lets make ABI version aviable in package index.

Signed-off-by: Petr Štetiar <ynezz@true.cz>