[Rpm-maint] [rpm-software-management/rpm] Add variable arrays to rpm (#1149)

[nim-nim]

Right now a lot of things need special tags in rpm just because they can be declared multiple times (for example `Requires`).

Tags are hugely inconvenient to manipulate in spec automations because they all come with their special handling requirements.

Please add real array primitives to rpm, so they can be replaced by bog standard rpm variables (I believe this would simplify lua bindings a lot too; lua makes heavy array use)

ie the usual non rocket science:

```rpm
%global array [a,b,c]
%append array [d,e]
%array %= [a,b,c]
%array %+= [d,e]
```



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