Add query formats for displaying tag numbers and names

[pmatilai]

Though I added these ages ago along with the arraysize thing, but guess
not.

[ffesti]

The patch looks good. But I wonder how useful the new formats really are. I have difficulty coming up with another use case other than what's in the test case. That doesn't mean I am against adding them. But the whole discussion started with packages having tags not yet supported by the system's rpm version. While this gives at least some way to show the tags in the package we should probably also add a way to query by tags number for those cases.

[pmatilai]

Yeah these formats aren't particularly interesting on their own, I'd say they're more like building blocks towards generalizing something like the --xml format which is half built-in when it arguably should be presentable with just a funky --qf format.

The "real" use-case would be something like --qf "%{=*:tagnum} %{*}" for a straight dump of the entire header without any borken xml, but that doesn't work at the moment, due to whatever limitations in the header formatting code.