[openalex] fix API so that we import only what is needed

Related to
gargantext/crawlers/openalex#6
4 jobs for 428-dev-worker-fixes in 56 minutes and 46 seconds (queued for 6 seconds)
Status Job ID Name Coverage
  Cabal
passed #17317
cabal

00:23:18

 
  Stack
passed #17318
stack

00:07:44

 
  Bench
manual #17319
allowed to fail manual
bench
 
  Test
passed #17320
test

00:25:43