[CMake] Tracking progress of CMake-ran TAR

[Person Withhats]

When tarting files from CMake (in order to use cross-platform work-ability
and what not) it'd be great to have a progress bar of any sort.

It's awkward to wait 30-60 minutes for file untarring with absolutely 0
information. I'm not aware of any way to do this through CMake directly,
only alternative is e.g. python script that does the untar for me.

Any suggestions?
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