Remove zonetree use from zone status

[tertsdiepraam]

Moves Progress into the API crate so we can construct that directly on the server based on the state machine instead of constructing it on the client side. This meant I had to change some methods to free functions which makes the diff kind of big, but mostly that just gets rid of a level of indentation.

Getting the serial of all the zones is kind of hacked in and probably incompatible with #552, but we can probably figure something out there.

I'm keeping this slightly hacky because I'm gonna pick up refining the status next. It will then reflect the state machine more closely.

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[bal-e]

Looks good! The way the SOA serials are being extracted is unfortunately not compatible with #552, but @tertsdiepraam and I agreed that I'll make a small follow-up PR to this to fix things. LGTM.