[Rpm-maint] [rpm-software-management/rpm] Tags as an alternative to Groups (#632)

[jengelh]

Excuse me if I do not see the complexity here. I am seeing the tag list as a (for rpm) non-interpreted single-value just like what `Group` is, where spaces are interpreted by downstream tools. Like so:

```
rpm -qa --qf="%{NAME}: %{GROUP}\n" >cache.txt
grep -Pi '^.*?:.*\b(shoot|arcade)\b' cache.txt
```

For a DB size of 1343 packages, the rpm command takes like 0.74s on my i7-8250U system, and the grep an additional 0.013s. Upscaling that for 60000 packages (last TW size I remember) would bring grep to 0.5s. Considering this example uses PCRE _and_ effectively does a full table scan here, that looks quite competetive for not even using a proper hash/btree index.

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