feat: add SMW Ask API as search backend option

[simontaurus]

• allows a fully customizable SWM Ask query for the search suggestions
• solves the problem with displaytitle like T143396

[alistair3149]

I am recently working on improving and refactor the search module in Citizen, part of the goal is to allow triggering other search endpoint with a text command.

Would you mind to explain to me how does the current SMW Ask search work in Citizen? I experimented with it but I was not able to get it working, so I figured it might be more suitable to ask you about it.

[simontaurus]

Sorry for the late response.
Basically it creates a SMW Ask API query from the user input using wgCitizenSearchSmwAskApiQueryTemplate which defaults to '[[Display_title_of::~*${input}*]] |?Display_title_of=displaytitle |?Page_Image=thumbnail |?Description=desc'.
So it selects pages where the Display title contains the search string and returns the full display title as well as the Page_Image property as thumb and the Description property as description.
Of course these properties have to exists and need to be populated in the mediawiki instance or need to be replaced by properties that do (this is clearly missing in my documentation).

• Property:Display_title_of is build-in but needs to be set within pages (see docs). To use the normal display title, this part of the query template should be [[~*${input}*]] (see docs) or, to match both, '[[Display_title_of::~*${input}*]] OR [[~*${input}*]].
• Property:Page_Image comes with Extension:Semantic_Extra_Special_Properties and needs to be enabled (see docs)
• Property:Description is a custom property (created by the user with [[Has type::text]]) that hold a short description text for a page

You can find a working example here. If you type Demo in the search bar the template '[[Display_title_of::~*${input}*]] |?Display_title_of=displaytitle |?HasImage=thumbnail |?HasDescription=desc' is used (see browser debug tools) and you will find e. g. DemoUser with all relevant properties pupulated.

Let me know if a can support further in the refactoring