[okular] [Bug 522026] Add support for UA-1 and UA-2

[Rasmus Enevoldsen]

https://bugs.kde.org/show_bug.cgi?id=522026

--- Comment #8 from Rasmus Enevoldsen <rasmus at enev.dk> ---
I looked at Evince and they have had also have an open issue since 2013
(https://gitlab.gnome.org/GNOME/evince/-/work_items/360).
I then searched the following projects that all use Poppler:
- Papers (https://gitlab.gnome.org/GNOME/papers)
- qpdfview (https://code.launchpad.net/qpdfview)
- zathura-pdf-poppler (https://github.com/pwmt/zathura-pdf-poppler). 
- LibreOffice (https://github.com/LibreOffice/core)
None of them use the `poppler_structure_element` API.

I also searched GitHub broadly and found no repo using it.
Every result was a copy of Poppler's own demo file
(https://gitlab.freedesktop.org/poppler/poppler/-/blob/master/glib/demo/taggedstruct.c).
This can be verified with:
```
gh search code "poppler_structure_element_get_text" --extension c | grep -v
taggedstruct
```
Which returns nothing.

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