[Rpm-maint] [rpm-software-management/rpm] Rust bindings for rpmlib (#429)

[Tony Arcieri]

@n3npq I'm working on simplifying the API and also switching from a `StreamingIterator` to a regular `Iterator` by using reference counting on header data. I had a question about this though:

> The trickiest problem with header tag data and MINMEM is that the header reference count sometimes ends up protecting header tag data, whether by intent or by accident is arguable.

What's the best way to model the lifetime of the tag data? It sounds like you're describing what I'd like to do: bound the lifetime of the header on the tag data, i.e. as long as someone holds on to a reference to tag data, they will also have to hold a reference to the header, and the header's reference count won't be decremented until they release both.

Is that a good approach, or can I do reference counting on the tag data itself?

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