Support for unpacking .xz archives

**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

---
Vote on this request

This is an invitation to the community to vote on issues, to help us prioritize our backlog. Use the "smiley face" up to the right of this comment to vote.

👍 "I would like to see this addressed as soon as possible"
👎 "There are other more important things to focus on right now"

We are also happy to receive and review Pull Requests if you want to help working on this issue.