Implement function to extract content of a tar+zstd archive

Basically look what has been done for the ponos agent and implement something similar (simpler?) to extract data from a tar+zstd archive. The TAR archive will be extracted, with all the files that it might contain.

We can keep the separate steps for ZSTD decompression + TAR extraction in separate functions but the ZSTD decompression should have a parameter that includes TAR extraction call as well.