Add: (org-ql-view--format-element) org-category property

Hopefully this does not cause a noticeable performance impact.  Maybe
the new org-element caching features in Org will help with that.

Fixes #363.

Reported-by: Gabriele Mongiano <https://github.com/kofm>

org-ql.info

@@ -1089,6 +1089,11 @@ File: README.info,  Node: 08-pre,  Next: 074,  Up: Changelog
      containing the desired link, then locate it within the entry, and
      then open it, the user can simply select the link and open it
      directly.)
+   • Items in ‘org-ql-view’ buffers now include the ‘org-category’ text
+     property, like Org Agenda buffers, which allows grouping with
+     ‘org-super-agenda’’s category-related selectors.  (#363
+     (https://github.com/alphapapa/org-ql/issues/363).  Thanks to
+     Gabriele Mongiano (https://github.com/kofm) for reporting.)
 
    *Compatibility*
 
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