ArticleInfo API: cache if the query took 5 seconds

[MusikAnimal]

Move API code to ArticleInfo controller

Bug: https://phabricator.wikimedia.org/T175763

[codecov]

Codecov Report

Merging #114 into master will increase coverage by 1.23%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #114      +/-   ##
==========================================
+ Coverage   43.43%   44.66%   +1.23%     
==========================================
  Files          34       34              
  Lines        2816     2765      -51     
==========================================
+ Hits         1223     1235      +12     
+ Misses       1593     1530      -63

Impacted Files	Coverage Δ
src/AppBundle/Controller/ApiController.php	13.46% <ø> (+4.42%)	⬆️
src/AppBundle/Controller/ArticleInfoController.php	90.9% <ø> (+90.9%)	⬆️
src/AppBundle/Controller/XtoolsController.php	50.38% <0%> (+1.52%)	⬆️

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