Expose sort orders from search engine in ApiQuerySearch

Expose sort orders from search engine in ApiQuerySearch

Selectable sort orders were added to search some time ago, but never
appear to have been used.  Expose them in ApiQuerySearch.

There is one large problem here, but it's not easily solvable.
Specifically supported sort orders vary per search engine, but the
available api parameters are calculated with the default search
engine. This is already a problem with search profiles so it's
nothing new, just continuing the existing problem. Much like
search profiles we hide the functionality when multiple engines
are available.

Bug: T195071
Change-Id: I187a530bc973c08386d2c2126e02a85b952d9022