add zfs integration

[etnbrd]

What does this PR do?

A first working version of an Zfs integration for the zfs filesystem and pools.

Motivation

I've been using this integration on my servers for the past few months, and I wanted to share with the community.

Review checklist

• PR has a meaningful title or PR has the no-changelog label attached
• Feature or bugfix has tests -> I didn't have the time to write unit tests yet, and not sure what would be a good testing strategy given the tight coupling with the zfs command. I might add some tests later.
• Git history is clean
• If PR impacts documentation, docs team has been notified or an issue has been opened on the documentation repo
• If this PR includes a log pipeline, please add a description describing the remappers and processors.

Additional Notes

I'm not sure about the app_uuid and the source_type_id in the manifest.json, so I left them out.

[jhgilbert]

I've created a docs review ticket so we can follow up when this is ready for an editorial review. Thanks!

[jhgilbert]

Approved with a style suggestion, thanks!