Support for unpacking .xz archives

[DWSR]

Describe the problem/challenge you have
I'd like to be able to unpack .xz archives in addition to .zip, .tar, and .tgz. .xz is commonly used to compress disk images in the IoT/SBC space.

Describe the solution you'd like
This should work the same way as unpacking currently-supported archive formats

Anything else you would like to add:
N/A

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[github-actions]

This issue is being marked as stale due to a long period of inactivity and will be closed in 5 days if there is no response.

[DWSR]

not stale

[joaopapereira]

Sorry I didn't pick this up earlier.

I think this is definitely something that can be added as a feature to the tool. Going to accept the feature.

Just a warning, the maintainer team at this point is completely swamped with work which might make it hard for us to pick this issue in the near future. Nevertheless, we are happy to help anyone that is interested in building this feature and PRing it to the code.
Also, let us know how this is impacting your usage of vendir so that we try to prioritize this feature accordingly